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Computer Won't Post...Sometimes


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#1
Spyderturbo007

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I'm trying to help a friend out and am completely stumped. He has been getting a no POST situation where we can't even get the Acer splash screen and the computer won't initialize the video card.

Here is what I've tried along with the result:

  • Tried working monitor = No POST
  • Installed new video card = No POST
  • Disconnected everything external except monitor and keyboard = No POST
  • Disconnected HDD = POST
  • Installed New HDD = No POSt
  • Disconnected New HDD = No POST
  • Removed DIMM 2 = POST
  • Installed DIMM 1 in Slot 2 = POST
  • Removed DIMM 1 and Installed only DIMM 2 = POST
  • Re-installed both memory sticks = POST
  • Reinstalled old HDD = POST (At this point everything is exactly the same as it was when I started and it wouldn't POST)
  • Threw my hands up in the air and said this is impossible
  • Put side back on case and set computer back on floor = No POST (What the heck is going on here?)
  • Removed DIMM 2 (again) = POST (Ahhhhhh!!!)
  • Ran MemTest 86 for one pass and Hitachi HDD Diagnostics = Passed
  • Tested the power supply along with SATA power connectors and the 4-pin CPU connector = Pass
  • Gave up and told him to run with one stick for now
  • Ordered new RAM which should be here in a few days(figured it was worth a shot)

I'm thoroughly confused and don't know what's going on with this thing. How would disconnecting everything, re-installing work and then I put the computer back on the floor and it refuses to POST?
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#2
admin

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My first thought was a case short, but since you mention it's an Acer that's doubtful. How did you test the power supply? Do you have another power supply to test?
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#3
Spyderturbo007

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I used a power supply tester that I bought off NewEgg awhile ago. It's pretty much just like this Rexus PST-3, but I think it's a different manufacturer.

He has an old Dell in his closet that I could cannibalize for the power supply. I would have to check the wattage to be sure. I doubt it has the SATA power connectors, but I think I have some in a drawer at my house I can give him.

Do you think a power supply would cause this issue? Although it tested good, I'm assuming things might change once you add a load.
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#4
admin

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Just because of the random nature I'm thinking power supply or motherboard. Power supply is much easier to swap.
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#5
deggitt

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Hi Spyder, check the motherboard capacitors around the processor & memory slots. Are any the tops bulging ?.
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