Video/USB problemClosed

Question

Hello,
On an older Dell Deminsion a few days ago my video went out, got the yellow light and a blank screen.  I also noticed that my USB lights were out on my hub.  On opening the computer I noticed that the fan on the "nvidia" video card had seized and was not running.  When I removed the video card and powered-up the computer the USB lights lit-up.  When I loosened the fan and put the back in it did not work and the USB lights went out. I got another "nvidia" card inserted inserted it and I get the same results as with the old card.  The question did I fry the mother board or power supply--if so how can I tell which one and if I can easily fix the problem.  I am reasonably handy with electronics and have multimeters, oscilloscope, etc. 

The hard drive is good (inserted it into a GearBox and can talk to it over USB on another computer) and BIOS seems good.

E Square

deepbreathe · Answer

Hye, repairs on mainboard are quite tought :)

Try to disconnect the fan of the card and start the pc just to try, it is possible that the fan  short-circuited especially if it was stuck for a long time.

E Square · Answer

Hi Deepbreathe,

Thanks for the response. I forgot to mention that I did disconnect the fan, that was the first thing that I thought, it made no difference. So I am left with determining if my problem is in the motherboard or power supply.

E Square

deepbreathe · Answer

are there a couple of capacitors near the vga port? are they in good condition?, i hope for you that the port isnt dead

Video/USB problem

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