bad cpu or motherboard

[afguy2082]

Hello I am new here and I ham having some issues with my computer and wanted to bump heads to see what you guys may think...here is the issue I got a computer from a friends after she had gotten a new one, it worked fine at first and when she had it. I took it apart to clean out the dust it get it all pretty, after all this is my "new" computer. so I cleaned everything put it back together and the computer ran but it wouldnt display anything on the moniter. wasnt sure so I took it back apart, this time I took the heat sink off to clean out dust from it that I had for got to do. I reinstalled heat sink and applyed new cooling compound. got everything together and this time it turns on then immediately off, as in the fan leds blink on then off and the fans dont even rotate. The motherboard wasnt beeping codes as I thought it should if there was an issue. I tryed a different power supply and same thing. I tryed disconnecting everything but power and same thing. NOW what confuses me if i disconnect the 12v core voltage power supply cable (the 4 prong power cable) fans come on and stay on but I tryed to attatch a video card and see it would show anything and no power was to the video card. I dont have a second motherboard or cpu to test if it's one or the other atm so I am lost....what do you guys think?

I have an intel p4 cpu
and intel d915gev motherboard

[DaveLembke]

How did you clean this system? Liquids, Vacuum Cleaner,  Air from Air Compressor, or canned Air?

Liquids are bad and can short out MB and corrode what else did nt short.

Vacuum Cleaner can suck off jumpers and cause all sorts of issues as well as the wand can create a static charge from the rapidly flowing air traveling through it with dust particles that steal electrons while passing through it.

Air Compressor ( Hidden Danger of Water ) ... Yes you have air at your fingertips from the compressor, but most air compressors condense the humidity of the newly compressed air and it settles in the tank. When you use the compressor to blow air out of it, if you dont purge the water from the tank, you are then spraying air with a water mist into the system.

Canned Air .. The correct way to clean a computer as long as the can is held right side up to blow the compressed gas out of it. If it is held to the side or upside down, it will blow its liquid gas out of it and you will see a white cloud and this will collect on the motherboard and run off like water until it evaporates.

[afguy2082]

I use a vacuum cleaned to clean the bottom of case thwn hand wiped/q-tip cleaned the rest

[JJ 3000]

That must have taken forever. Did you ground yourself before touching the mobo?
Whe you removed the heatsink you may have pulled up te processor. Carefully remove the CPU and reseat it.

[afguy2082]

have tryed to reset it, what I am confused about is the board is not POSTing OR beeping anything BUT it turns the fans on and all when I leave the cpu power unpluged

[JJ 3000]

Did you ground yourself before you touched the internal components? You may have to reseat the RAM and make sure your power connections are plugged in properly. Have you checked your motherboard book?

[afguy2082]

yes everything is plugged in and yes I have checked my manual. I pretty much know there is a failure but I dont know if it is the motherboard because it's not beeping anything or if it's the cpe because I can remove the cpu power cord and the fans will fire up (still nothing on moniter or beeps).....and I dont have a test mobo or cpu :-(

[drmsucks]

when I leave the cpu power unpluged

because I can remove the cpu power cord a

What do you mean by this? Are you talking about the fan lead? What "CPU power?"

[afguy2082]

the 4 prong plug that sends power to the cpu

[JJ 3000]

Did you ground yourself before you touched the internal components?

That must have taken forever. Did you ground yourself before touching the mobo?

Well, did you? ESD can fry your motherboard

http://download.intel.com/support/motherboards/desktop/sb/c6413602_en.pdf

[patio]

A vacuum should never be used inside a PC case.
They generate huge amounts of static electricity.

[afguy2082]

ok I understand this it was my mistake....I am asking you opnion if it's a fried mobo or cpu

[JJ 3000]

Well, if you used a vacuum cleaner inside your computer and wiped the circuit boards with a cloth, you may have fried the entire system

I would take it to the local computer shop and have a tech examine it.

Hopefully you didn't pay too much for this machine. Static electricity can destroy all of the delicate circuitry inside of computers.

[drmsucks]

ok I understand this it was my mistake....I am asking you opnion if it's a fried mobo or cpu

Impossible to tell from here - once again try to re-seat the CPU. Release the CPU and heatsink from the socket, re-insert carefully and while exerting a very slight downward pressure, lock the CPU into place and lock down the heatsink. While the heatsink and CPU are out, you can clean and re-apply thermal compound if you think that you need to. As always, protect from static and try to avoid touching the pins of the CPU.

Good luck.