Question about HP Media Center m7250n (ED842AA) PC Desktop

1 Answer

Turn on my dell green light comes on and begins to open windows xp before it compltety opens it shuts down and the yellow light starts flashing , I turn off the computer and and let it set for a few moments , turn it back on and the same thing happens ? wrong , help !

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • HP Master
  • 5,660 Answers

Power Supply is bad Ron.

Electrolytic Capacitors inside the Power Supply are breaking down.

To wit;

Since you didn't state the model number, I'll just choose one for an example, and the Troubleshooting Tools and Utilities information;

http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/tindex.htm


http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/tools00.htm#wp1105370

http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/tools00.htm#wp1114432

Took you the 'Long way' to show you the steps in finding troubleshooting information. May help you in the future.

"Blinking Yellow - A power supply or system board failure has occurred"

Now about Electrolytic Capacitors;

The Electrolytic Capacitors used on your motherboard, (Unless some are solid Polymer capacitors), are Radial Aluminum Electrolytic Capacitors.

A basic example,

http://www.amazon.com/Gino-Radial-Aluminum-Electrolytic-Capacitors/dp/B006228QMY


Basic construction of a Radial Aluminum Electrolytic Capacitor:

A) The case is a thin aluminum cylindrical shape. Looks like an aluminum 'Coca-Cola' can with no top, or bottom.

Wrapped with a plastic sleeve.

B) The top is a flat thin aluminum round disk, and has a shape etched partway into it. Usually a lK or X.
This is the Vent Cover.

C) The bottom is a flat synthetic rubber disk, and is called the Bung.
The two leads of the capacitor come through the Bung.

D) Inside the case of the capacitor are three strips;
1) One strip is thin aluminum metal, and is called the Conducting Strip. It has the Positive ( + ) lead attached to it. (Lead - think wire)

2) The second strip is also thin aluminum metal, but has a non-conducting medium applied to it.
It is the Non-Conducting Strip, and has the Negative lead attached to it.

3) The last strip is a paper-like strip, and is soaked with Electrolytic Paste.

The paper soaked strip is laid in-between the two metal strips, and all three are rolled up tightly.
(In reality there are many layers of these strips)

When an Electrolytic Capacitor starts to fail, the Electrolytic Paste develops a gas inside the capacitor. Hydrogen Gas.
The gas expands, and starts pushing Electrolytic Paste out of the capacitor.

Either the lK or X of the Vent Cover will pop open, and paste will ooze out,
And/Or,

Paste will ooze out of the seal area, around the outside edge of the Vent Cover,
And/Or,

One side of the Bung at the bottom of the capacitor will be pushed out, and paste will ooze out.

So much paste loss, and the capacitor operates at a weakened state.
TOO much paste loss, and the capacitor fails.

A capacitor is designed to slowly build up a charge, then release it all at once.
Older camera designs use capacitors for their flash unit.

Another way of explaining, although crude, is a large swimming pool is slowly filled with water by a garden hose, then one wall of the pool is taken down all at once.

This is why a Power Supply can start to work, then fail.
Some of the capacitors inside are failing.

Just thought it would be better than stating, "Replace your Power Supply"

Do I recommend trying to repair the Power Supply?
NO
Dangerous (As in could KILL you), voltages are inside, even with the Power Supply unplugged from power, and for weeks, months, and over a year, after being unplugged from power.

Also clean the inside of the computer out with a can, or two of compressed air for computers. Computer unplugged from power, AND Anti-Static Precautions -> FOLLOWED.

The Power Supply in your computer is an SMPS.
Switched-Mode Power Supply
The two cooling components for the SMPS are Heatsinks, and a small internal Fan,

http://en.wikipedia.org/wiki/File:ATX_power_supply_interior-1000px_transparent.png

The Heatsink/s are shown in-between the letters B and C, and
C and D.
Finned aluminum 'blocks' connected together in a vertical line.
(Vertical line in the photo)

A Heatsink absorbs heat from whatever object it is placed against, and the fins of the Heatsink radiate the heat away.
The small internal fan helps carry heat away from the fins.

When in-between the fins, and around the fins of the Heatsink, are clogged with 'Gunk', and the Fan's blades, center hub, and surrounding cage (Shroud), are clogged with 'Gunk', the cooling capacity drops tremendously.

Just takes a light coat of 'Gunk'.
('Gunk' = Dirt, dust, hair, lint, etc)

Heat = Wasted Energy
The Power Supply tries to keep up with the call for power, but eventually cannot, and components inside start to fail.

For additional questions please post in a Comment.

Regards,
joecoolvette

[One more thing. Dell used to be a proprietary computer manufacturer. This means they wanted THEIR parts used in THEIR computers.

One design change they had made, was to change the standard pinout of the ATX main power cable, coming from the Power Supply.

Had the Power Supply manufacturer design, and make Power Supply's to their (Dell) ATX main power cable designation.

They also had the motherboard manufacturer, change the ATX main power cable connector pinout, on the motherboard.

Examples of both types of ATX main power cables that are used,

1) 20-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

2) 24-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

1) Orange wires are 3.3 Volts. (DC)
2) Red wires are 5 Volts. (DC)
3) Yellow wires are 12 Volts. (DC)
ALL Black wires are Ground wires.

You can see the Standard pinouts for the wires above in the links.

USING the Lock on the side of the ATX main power cable's connector, use it to orient the connector, and follow the pinout of those wires.

Are they the same as the ones in the links?

People with these older types of Dell computers in the past, were replacing the Power Supply, BUT not buying from Dell.
This means they bought aftermarket Power Supply's.

Wiring pinout for ATX main power cable did Not match.
MANY people burned out their computers.
'Smoked' the motherboard, Processor, Ram Memory, Harddrive, and a graphics card IF used.

Yes. People were SO happy! (?)
Dell changed pretty quickly.
Check your ATX main power cable.

Posted on Oct 27, 2012

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
s4u311
  • 813 Answers

SOURCE: hp wont turn on flashing green light in back an flashing blue light in front.

open your cpu remove the ram clean it put it back your problem will be sloves

Posted on Jul 16, 2008

cpenzes
  • 1102 Answers

SOURCE: computer tower started beeping

If you added more memory this may make your tower beep.
If so I WOULD REMOVE THE ADDED MEMORY AND THEN RESTART

Posted on Jan 12, 2009

  • 139 Answers

SOURCE: Computer was shut down incorrectly and now i cannot get past this

scan ur system with mcafee 8.5i antivirus and go to safe mode and login to admin account.

Start->run-> msconfig->startup (tab)->disable all->restart-> see the message is gone.

Posted on Jan 30, 2009

jgwhomeequip
  • 1902 Answers

SOURCE: My hp a500n will not turn on

Check your BIOS battery make sure it is working correctly and that it is not out. You can use a battery tester to see.

Posted on Feb 14, 2009

  • 2 Answers

SOURCE: HP Media Center Power Up Problem

replace the power supply-from a computer store, should be no more than 30 dollars

Posted on Mar 15, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

LiftMaster Pro 1/2 hp 41AS050-1 won't shut. when


Check the resistance down button (There is one for down and another one for up). You may need to adjust the sensitivity. That way even if for some reason the have hard time coming down, less sensitivity may solve that issue.

Oct 22, 2013 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My PS3 (40Gb) has just shut down on me. I was playing COD Modern Warfare 2 when the PS3 just shut down and then beeped at me 3 times the red light started flashing and when I pressed the power area the...


Its called yellow light of death. Here is a link to my step-by-step instructions on how to fix.


http://www.fixya.com/support/t8396931-ps3_turns_ok_but_turns_itself_off_after

Feb 24, 2011 | Sony Playstation 3 (PS3) Console

1 Answer

I have a dell c521 desktop I bought it from a rental place I do not have a reboot disc I've called dell suport they were no help is there any keyboard configureations to get this rebooted


***Using the Start Menu
  • Press a Windows key (the ones with the Windows symbol on as shown right), this will open up the Start Menu.
  • Use the cursor keys (the ones with arrows on) to highlight 'Turn off Computer' and press Enter to select it
  • A dialog box will open. Use the cursor keys to to highlight 'Shutdown computer', 'Turn off' or whatever your version of Windows says, and press Enter again.

***Using the 'three finger salute'
Hold down Ctrl and Alt, and press Delete.
Windows 2000 and XP Home Edition users will be presented with a dialog box with buttons on:
  • · Use the cursor keys to select the 'Shut Down' button and use Enter to select it.
  • · Select 'Shut down' from the list using the cursor keys and press Enter one more time.

In other versions of Windows the Task Manager will open:
  • · Hold down Alt and press U to open the 'Shut Down' menu.
  • · Use the cursor keys to highlight 'Turn Off' and press Enter.

***Hit Alt F4 'till you can't any more
The final method of shutting down that I will explain here is to hold down the Alt key and press F4 repeatedly. This will close every application that is open on Windows and eventually will close Windows itself. You may be asked if you want to save files by some programs, if so use the cursor keys and Enter to get past these dialog boxes.

Oct 24, 2010 | Dell Dimension C521 PC Desktop

1 Answer

Windows XP 'writemaster' not recognised


There were more problems and I needed a solution fairly quickly. The solution I used was to wipe the hard drive, re-install windows xp and start again. A bit drastic but the problem did not re-occur.

Apr 12, 2009 | Computers & Internet

1 Answer

Windows XP won't start


The amber light is the error light on a Dell. It can mean a few things. 1. RAM has went bad, not properly seated. 2. Video card has went bad or come unseated. 3. Power supply is not working properly; or 4. Motherboard has went bad. Hope this helps & please remember to rate my answer.

Jan 02, 2009 | Dell Dimension 2350 PC Desktop

1 Answer

Epsom Sytlus DX4450


Using the Ink Cartridge Replacement utility in Windows

1. Open the Printers window by following the appropriate steps for your operating system.

In Windows 2000: Click START > SETTINGS > PRINTERS.

In Windows XP: Click START > CONTROL PANEL > PRINTERS AND FAXES or PRINTERS AND OTHER HARDWARE. (Select VIEW INSTALLED PRINTERS under PRINTER TASKS if no printers appear.)

In Windows Vista: Click START > CONTROL PANEL > HARDWARE AND SOUND > PRINTERS.

2. Right-click your printer model and select PRINTING PREFERENCES.

3. Click the MAINTENANCE tab.

4. Click the Ink Cartridge Replacement utility icon and follow the on-screen instructions to replace your ink cartridges as necessary.

Caution:
Never turn off the printer while the On light is flashing or you’ll waste ink. If the ink light flashes, press the Stop button and press down all the cartridges securely.



Using the control panel

1. Turn on the printer.

2. Open the scanner and make sure its support locks in place.

3. Press the STOP button. The print head moves to the ink mark to indicate which cartridge is low or expended.

4. Press the STOP button again.

If another cartridge is low or expended, it moves to the ink mark. Press the Stop button again to see if more cartridges are low or expended.

If no other cartridges are low or expended, the print head moves to the replacement position on the right.

5. Open the cartridge cover.

6. Squeeze the tab on the cartridge and lift the cartridge straight up to remove it. Dispose of it carefully. Do not take the used cartridge apart or try to refill it.

7. Before opening the new cartridge package, shake it four or five times.

8. Remove the cartridge from the package, but be careful not to touch the green chip on the cartridge.

9. Remove the yellow tape from the bottom of the cartridge.

Caution:
Do not remove any other labels or seals, or ink will leak.

10. Insert the new cartridge into the holder and push it down until it clicks into place.

11. Once you replace all the necessary cartridges, close the cartridge cover and push it down until it clicks into place.

12. Release the scanner support and close the scanner.

13. Press the Stop button to begin charging the ink. This takes about 1 1/2 minutes.
When the On light stops flashing and remains on, ink charging is finished.

Caution:
Never turn off the printer while the On light is flashing or you’ll waste ink. If the ink light flashes, press the Stop button and press down all the cartridges securely.

Jun 05, 2008 | Epson Printer

2 Answers

MY inspiron 1150 won't power on


there is a problem with your memory. TURN OFF THE LAPTOP turn the laptop screen side down there are two areas you can open. open the one more to the centre remove one or all memory module inside replace with new memory module. or if there are two memory modules in take one out then turn the laptop on if it does not start take the other out, put in the one you took out first back in start the laptop if none works by themselves you need new memory
thats the solution REMEMBER TO RATE THE SOLUTION THANKS

Apr 09, 2008 | Dell Inspiron 1150 Notebook

1 Answer

Pover up trouble


sounds like something is drawing down on your 12 volt supply drives or on board regulators. Try it without the drives connectged, and see if you can get the system to boot up(you'll just get a notice that your drives are unavailable, but you'll already know that, right?

got backup for your Dell?

Feb 15, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

Not finding what you are looking for?
HP Media Center m7250n (ED842AA) PC Desktop Logo

63 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18402 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Are you a HP Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...