Question about HP Pavilion A635W PC Desktop
1) There is a such thing as a bad Power Supply. New or not.
2) You may not have all required power cables plugged in.
Besides the ATX main power cable, there is also a 4-pin ATX +12 Volt power cable, that has to be plugged into the motherboard.
This is HP Support, and the Motherboard Specifications page,
I would like you to scroll down to the illustration of the motherboard.
To the left of VIA KM400A is a small square. To the top of the small square is printed ATX12V
This is where the 4-pin ATX +12 Volt power cable plugs into.
(The motherboard chipset is the Northbridge chip, and the Southbridge chip.
The VIA KM400A chip is the Northbridge chip. Should be under an aluminum finned Heatsink)
I would also like you to clear CMOS Error codes.
Computer unplugged from power press the Power On button, and hold it in.
Hold it in for a count of 5 seconds. (And I mean at least 5)
Let go of the Power On button.
Do this procedure 2 more times.
This action will clear CMOS Error codes, and reset BIOS back to the factory default settings.
Plug the computer back into power. WAIT 1 minute, then turn the computer on.
Be sure ALL power cables are plugged in, and plugged in tightly.
A) ATX main power cable. (20-pin ATX main power cable)
B) 4-pin ATX +12 Volt power cable
C) All 4-pin standard Peripheral power cables.
1 is for the Harddrive.
1 is for the CD or DVD optical drive, ( Or 2 if more than 1 optical drive)
1 may be used in conjunction with an adapter cable, and used for power to a computer case fan.
3) Make sure the ram memory module/s are seated in tightly. (Module = 'Stick')
You may wish to clean the gold plated contact pins on each ram memory module.
The gold plated contact pins develop corrosion.
Computer unplugged, and you have followed Anti-Static Precautions, remove each ram memory module.
Use a pencil eraser to clean each contact 'strip'.
If you use an eraser on the end of a pencil, refrain from letting the metal band contact the contact pins.
Just takes a few strokes of the eraser on each contact pin.
After you have finished cleaning a contact strip it may look as though you have done nothing at all
I assure you that you have. Doesn't take much corrosion to make a bad contact.
Use air to remove the eraser dust before you reinstall the ram memory.
If air from a can of compressed air for computers is not available, air pressure from your mouth is sufficient.
If this doesn't solve the problem please post back in a Comment.
We will go on to test the various voltages coming out of the Power Supply.
(If a multimeter is not available an economical unit can be purchased. Most auto parts stores carry them, as well as a multitude of other stores. A $5 to $20 unit will do just fine.
The voltages involved are 3.3 Volts, 5 Volts, and 12 Volts.
ALL are DC voltage.
Two D cell flashlight batteries produce 3 Volts DC )
Posted on May 29, 2011
More than likely you have accidentally unseated your video card open the box and press the video card tightly into the pci slot.
don't forget to give testimonial and the votes 4 thumbs up if I helped.
Posted on May 29, 2011
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Posted on Jan 02, 2017
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