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Dear,
first check power cable and availibility of ac supply from socket.
second thing is that check fan works or completly dead system.
check when u switch its power button, the fan of back supply runs, even for a moment or not.
if nothing happened then check have u set the jumper for power on, reset hdd led, are at their own places in the motherboard or not.. read manual for its settings.
moreover, if all are ok and the system is stilling not working then disconnect all the power and data cables to hard driver and other drives like cd, dvd and switch it on after confirmation that only power cable to motherboard is connected..
regards,

dont forget to rate, if functional

Posted on Aug 22, 2008

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Check cable first rats might be the culprit then replace power supply.

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I have a hp officejet 7410 it keeps losing connection with wireless router, I need to do a hard reset to factory out of box condition, starting from scratch seems the only way to get it back on line,...


May be you can try to perform partial reset by :
  1. Disconnect the power cord from the back of the product, and then wait for 20 seconds.
  2. Press and hold # and 3 on the product control panel while connecting the power cord to the back of the product.
  3. Release the buttons when the product turns on. The reset is complete..

Step one: Reset the power module The power module has a safety feature inside that protects the product during a power surge. If you experienced a recent power surge, the power module might need to be reset. Use the following steps to reset the power module.
  1. Unplug the power supply from the rear of the product.
  2. Unplug the power cord from the electrical outlet, power strip, or surge protector.
  3. If the product uses a power module with a detachable power cord, disconnect the cord from the power module.
  4. Wait 15 seconds.
  5. Reconnect the power cord to the power module.
  6. Plug the power cord back into the electrical outlet. Do not use a power strip or surge protector.
  7. Check to see if the power module has an LED.
    • If the power module does not have an LED, continue to the next step.
    • If the power module has an LED, check to see if the LED lights up.
      • If the LED does not light up, contact HP to replace the power module. To buy a compatible power module, right-click the following link, How to Buy HP , and then click Open in New Window .
      • If the LED lights up, continue to the next step.
Step two: Test the power on the All-in-One Follow these steps to test the power on the product.
  1. Reconnect the power supply to the rear of the product.
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Dec 02, 2010 | PC Desktops

1 Answer

Compaq sr1350nx Well, just installed a new motherboard and replaced all the parts correctly as they were. Checked all connections fired it up and actually got a screen with a few numbers then a blinking...


It IS the Power Supply cjshearer11.

The green LED light flashing is a diagnostic light now. The diagnosis is a bad Power Supply with a Gree LED flashing.

Secondly, notice how the accessories are unplugged, and the Green LED light is solid Green?

1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts. Depends on what Processor it is.

Compaq Presario SR1350NX?
Uses an Intel Pentium 4, Model 519 (LGA 775 processor socket)

3.06GigaHertz maximum frequency rate (3.06GHz 'speed')
533MegaHertz Front Side Bus. (533MHz FSB)
1MegaByte of L2 cache. (1MB L2 cache)
Can use up to 89 Watts,

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors#Prescott_.2890.C2.A0nm.29

You press the Power On button. Inside the plastic Power On button is a Power On switch.

(Typical ATX power on switch,

http://www.directron.com/atxswitch.html )

The Power On button presses against the Power On switch making a momentary contact.
(The Power On switch is a Momentary Contact Switch)

This closes a circuit temporarily that has 5 volts present. The 5 Volt Standby power.
(The 5 volts is always present when the Power Supply is plugged into power)

The 5 Volts is directed towards a circuit within the Power Supply.
The Soft Power On circuit. (PS_ON)

This in turn 'excites' the Power Supply, and turns the Power Supply on.
(No pun intended)

The first chip on the motherboard to receive power is the BIOS chip.
(Chip and Chipset are slang terms for I.C.
Integrated Circuit)

Burned into the BIOS chip is a small program. The BIOS program.
The BIOS program looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.
(Windows XP, and Windows Vista are two examples of an O/S)

Your Power Supply has a weak voltage power rail.
(There are three main power rails in the SMPS in your Presario computer's Power Supply.
{Switched-Mode Power Supply}
The 3.3 Volt power rail, the 5 volt power rail, and the 12 volt power rail)

Enough power to light LED lights, and maybe spin fans, (Or spin a few times, and stop), but Not enough power to turn the Processor on.
NO Processor operating, no finding the boot record of the Operating System, on the Harddrive.

Do you have a KNOWN to be good, compatible power supply in an unused desktop computer, to use for a test unit?
Someone you may know may have upgraded to a better computer, and have a working computer with a Power Supply that you could borrow.

Needs to be an ATX form factor Power Supply.
Form factor for a Power Supply refers to the size, and shape of the case, for one.
It also applies to the power cables coming out of the power supply.

The size and shape of the case is;
6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.

Needs a,
A) 24-pin ATX main power cable,
B) 4-pin ATX +12 Volt power cable,
C) Enough standard 4-pin Peripheral power cables, for the optical drive/s (CD/DVD drive/s),
D) One SATA power cable

A) 24-pin ATX main power cable:

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

B) 4-pin ATX +12 Volt power cable: (Power for the Processor)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

C) SATA power cable: (Power for the SATA Harddrive. 15-pin cable)

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

D) Standard 4-pin Peripheral power cable:

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

The ATX power supply inside that Presario, is probably rated at a maximum Wattage of 250 to 300 Watts.
Made by some generic Power Supply manufacturer.
Bestec, HiPro, or Delta.
Around 90 percent of the desktop PC's out there use an ATX Power Supply.
You can buy one with as much Wattage as you want, won't hurt the computer.
A computer ONLY uses the power it needs, and No more.

Regards,
joecoolvette

Oct 20, 2010 | HP Compaq Presario SR1350NX (PP196AA#ABA)...

1 Answer

My desktop computer wont power on


Suggest you see if the problem is the Power On switch, or the Power Supply.

(First check to see if the receptacle in the surge protector, that the computer is plugged into, has power.
Have had a few bad surge protectors, where just THAT receptacle was bad.

"Hmmm, surge protector power on LED light is lit. Monitor, printer, and router have power, that are plugged into the surge protector.

Plugged a lamp into THAT receptacle, and found it to be bad)

To test whether the Power On switch, or the Power Supply is bad, a jumper wire is used to bypass the Power On switch.

[ The Power On switch is located inside the plastic Power On button.
This is an example of a generic ATX Power On switch, that I have found fits many computers,

http://www.directron.com/atxswitch.html ]

The jumper wire is used on the 20, or 24-pin ATX main power cable's connector.
While still plugged into the motherboard.

The jumper wire connects to the Soft Power On wire, (Green), and to any Ground wire. (Black)

Example of a 20-pin ATX main power cable, and it's respective connector,

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

Example of a 24-pin ATX main power cable, and it's respective connector,

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

Using the jumper (Wire) to bypass the Power On switch, turns the Power Supply on?
The problem is a bad Power On switch.

Using the jumper to bypass the Power On switch, does Not turn the Power Supply on?
The problem is a bad Power Supply.

There is a correct procedure for performing this test.
Post back in a Comment if you wish to know.

Regards,
joecoolvette

Sep 20, 2010 | PC Desktops

1 Answer

My desktop dont come on


1) Check THE receptacle in the surge protector the computer is plugged into.

I have found more than once that One bad receptacle in the surge protector is bad.

"Hmmm, surge protector power on light is lit." "Monitor has power, amp for the speakers has power, and the router has power."
All plugged in to the same surge protector.

Tried a table lamp into the receptacle the computer was plugged into, Nothing.
Replace surge protector.

2) Bypass the Soft Power On of the Power Supply, and see if the problem is the Power On switch, or the Power Supply.

If you bypass the Soft Power On of the Power Supply, and the Power Supply comes on, the problem is a bad Power On switch.

If you bypass the Soft Power On of the Power Supply, and the Power Supply does Not come on, the problem is the Power Supply.

If you wish to know how to perform this simple test, just state so in a Comment.
(Believe upper right of your page)

Jun 17, 2010 | E-Machines eMachines Desktop PC

1 Answer

Emachines pc will not power up. Outlet that it's plugged into is powered.


Suggestion is to bypass the Soft Power On of the Power Supply, and see if the problem is the Power On switch, or the Power Supply.

(The Power On switch is located inside the plastic Power On button.

This is an example of a generic Power On switch, that I have found fits many computers,

http://www.directron.com/atxswitch.html )

If bypassing the Soft Power On turns the Power Supply on, the problem is a bad Power On switch.

If bypassing the Soft Power On does Not turn the Power Supply on, the problem is a bad Power Supply.

Should you wish to know how to perform this procedure, just state so in a Comment.
(Believe upper right of your page)

Jun 16, 2010 | E-Machines eMachines Desktop PC

1 Answer

System turns on however hard drive will not cycle nor will mouse or key board activate


Turn power off and unplug power from computer.
Unplug printers,backup drives and speakers.
Open case and unplug power supply from the board.
plug power cord back in press the power button.
Of course nothing will happen.
unplug power cord again.
plug power supply back into the board.
plug power cord backup and press power switch.
If nothing happens unplug power cord again.
pull out your memory sticks and plug cord back in and press power button.
Of course not much will happen.
But really something is happening to your computer so continue.
Pull power cord and replace memory sticks.
replace power cord and press power switch.
Continue this pulling out pci cards one at a time until you find out what the problem might be.
Try different keyboards and mice too.
Good Luck

Oct 27, 2008 | Intel PC Desktops

1 Answer

My Compaq Presario will not start since we had a power failure in our town yesterday. It seems like it is unplugged, but it is plugged in. Can you help?


Can you check if the power is connected to the ac outlet, and if the cpu has a power. If no power in the cpu even the power cord is pluuged in the outlet of the power source the problem is your power supply. Maybe the fuse blow up when the power is back after the power failure. But sometimes the cpu has no power but the monitor have a power it's also power supply failure the dc output of power supply is not working. the best solution is to replace the power supply with the same wattages or higher.

Apr 15, 2008 | PC Desktops

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