Question about HP Pavilion Media Center m8425f 2.66GHz Core 2 Quad Q6700 3GB 1TB DVDRW DL LS GeForce 8500GT Vista H... PC Desktop

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Hp pavilion has the green light in the back on but doesnt turn on

The light isnt flashing its just solid on when i unplug the cord it takes it a minute to go out and when i plug it back in comes right back on but the computer will not start

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2 Answers

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  • HP Master
  • 5,660 Answers

I would bypass the Power On switch with a jumper wire on the 24-pin ATX main power cable's connector, and see if the problem is a $5 Power On switch, or the Power Supply.

Ready?

This diagnostic test does Not involve the Power On switch, or it's wires. There is no cutting of the insulation of ANY wires.

You need a paperclip.

Follow Anti-Static Precautions.

Anti-Static Precautions;
Your body carries Static electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.
Relieve your body of Static BEFORE reaching inside your computer.

Computer on a table, computer unplugged from power, computer case open;
TOUCH an unpainted surface, of the metal frame of the open computer case.
This action will relieve your body of Static.

IF, you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.

Top View of the motherboard, no power cables attached, no hardware attached,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01324212&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3692730

The 24-pin ATX main power cable connector for the motherboard, is on the right side of the Ram Memory slots, and next to the outside edge of the motherboard.
Whitish in color, two columns of 12 socket holes.

This is a general example of a 24-pin ATX main power cable, and it's respective connector on the motherboard,

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

Viewing the photo all the way to the right, note that the 24-pin ATX main power cable is plugged into the motherboard. This is the way you want it when testing.
(NOTE* Color of connectors does NOT matter)

Note the Green wire.
The Green wire is the Soft Power On wire. Abbreviated as PS_ON.

Note the Black wires. -> ALL Black wires are Ground wires.

A paperclip is used to Temporarily, touch the Green wire to ANY Black wire.
(The Power On switch is a Momentary Contact Switch)

The paperclip is bent into a U-shape. The top of the U is wrapped a few times with black plastic electrical tape.
This taped area is for your fingers, and thumb to hold onto.
Turn the U-shape over, and it is the 'legs' that you are going to use.

One 'leg' of the U-shaped jumper wire, is inserted down into the socket hole with the Green wire.

The Back of the 24-pin ATX main power cable's connector, is where the wires go in.
This is the side the jumper wire leg goes in.

Goes RIGHT NEXT TO the insulation of the Green wire, slides down into the socket hole, and touches a metal terminal at the end of the wire.

The leg of the U-shaped jumper wire, has to go down in the socket hole pretty far. (3/8ths of an Inch?)

It MUST touch that metal terminal at the end of the wire.

[ This is an example of the female metal terminal I am referring to,

http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-US

The left side has tangs (2), that are crimped around the insulation of the wire. The Right side is the front, and you can see the front tip of them in the center photo of the Playtool link ]

The other 'leg' of the U-shaped jumper wire, goes down into ANY socket hole, that has a Black wire in it.

Bend the paperclip, attach tape, then try it in the two socket holes.
(Green wire / Black wire)
Once you have it bent to fit, and have tried using it, remove, and plug the Power Supply into power.

Now use the U-shaped jumper wire.
The contact time is no more than 2 seconds.

Concerned about getting shocked?
The Soft Power On circuit uses 5 Volts DC.
In comparison two D cell flashlight batteries produce 3 Volts DC.

NOT saying there may be a small spark!
You may wish to use a glove on the 'jumper wire hand'.

Power Supply comes on? You have a bad Power On switch,

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

Power Supply does NOT come on? You have a bad Power Supply.

For additional questions please post in a Comment.

Regards,
joecoolvette

Posted on Nov 08, 2012

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  • HP Master
  • 27,725 Answers

Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty

http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm



One bad lead can cause a computer to continue on a cycle of restarting or to shutdown or fail to detect/ boot up a computer hard drive



Test all leads that attach to your hard drive power and data cables IDE SATA

the leads from your MOTHERBOARD TO YOUR HARD DRIVE make sure they have a secure dust free connections and are not faulty or just replace them they could be faulty


make sure all leads that are attached to your dvd\cd floppy drives have secure connections and are not faulty or just replace them they could be faulty


computers need power and data to travel through every working device to continue its cycle and have an end so any faulty leads will end up with a computer error


even something as small as a faulty electrical or fan lead can cause you problems



motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail



check all electrical power input and extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working



also check the Cmos battery and computer RAM modules make sure they are securely seated with no dust built up or in the sockets on some motherboards cmos batteries are soldered in


check you CPU central processing unit make sure its securely seated and has thermal paste it might be getting to hot the thermal paste will help disperse the heat

Thermal compound is a sticky paste that is placed directly onto the CPU.


Allowing for a more direct heat transfer between the CPU and HEAT SINK and preventing air gaps from forming between the CPU and heat sink.

hope this helps


http://www.hardwaresecrets.com/article/Thermal-Compound-Roundup-February-2012/1490


another possible reason could be a memory dump you might be running to many programs at the one time putting to much strain on the CPU central processing unit

scroll to bottom toolbar bottom of screen right click select task manager
applications you will see whats running if you see anything you dont need running select end now

also under processes see what is ticking over again if you see something you don't need to be running end now or you might uninstall that program and some unnecessary programs


not having enough computer ram can cause memory dumps


If you are not sure if a module is right for your system use the Crucial Memory Advisor tool for a list of guaranteed compatible modules.


first you will need to select the manufacturer from a drop down list then select your product line from a drop down list then select the model then click find it will take you directly to compatible ram also you will have an option to scan your system


you should always for a guarantee on any ram modules when purchasing them or buy working pairs if possible



hope this helps

Posted on Nov 08, 2012

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Ownij
  • 67 Answers

SOURCE: pc won't power ( turn on)

The green light is most likely your lan card/port. If the cord/outlet are sparking when you plug it in, I would say try plugging something else into that socket, if you get the same spark, I'd call an electrician. Also try plugging the pc into a different outlet. As far as the computer, if its not the outlet then it is the power supply, your motherboard may be fried in the process but if this isn't an issue with that outlet, then you should take it in to a shop.

Posted on Mar 16, 2009

thegoshem
  • 61 Answers

SOURCE: Green light flashing on back of unit near power cord also green light flashing on motherboard near power supply plug in.

I would suggest trying to replace the power supply. If that does not fix the issue, i would need to hear more about the computer.

Posted on May 06, 2009

lglalight
  • 1 Answer

SOURCE: computer wont turn on

i had the same problem its going to be your power supply it probably burned out. when i changed mine it worked perfectly.

Posted on Jun 01, 2009

  • 169 Answers

SOURCE: Power Issue on my HP m7470n

try this link.....it has the steps you need to follow
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01732674&cc=us&lc=en&dlc=en

Posted on Jun 24, 2009

  • 122 Answers

SOURCE: My HP Pavilion computer unit will not turn on.

If you have no activity at all, no lights, no noise at all etc. it is probably the power supply. It can be replaced with some mechanical skill and attention to where the wires plug in, but the major problem is the age. Older computers have a different power supply then currently available. If you have data you need to retrieve the physical hard drive can be removed and placed in a relatively inexpensive USB housing and accessed from a new computer. If you want to try and get it repaired find an older, small repair shop and with luck they may have or be able to locate the correct replacement. Since it is 10 or more years I would not put much money into repairing it so check in advance about minimum rates etc. so you don’t end with a money pit. Good Luck

Posted on Jul 20, 2009

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