Question

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NO VIDEO SIGNAL

By dtaveras79 ·
Hello,
I have an ASUS P5N-E SLI motherboard. Installed are two sticks (1Gig each) of DDR2 RAM, a EVGA GeForce 7950 GT PCIE video card, Intel Quad core processor, etc. When I power on the computer, the mobo light goes on, the PSU powers on, and so does the case fan and the the video card's fan. What fails to go on is the CPU's heatsink fan. Also I get no video signal on my LCD. I tried using a brand new video card to see if the video card is the problem, but I get the same error with the new video card. So the video card is ruled out.
Has anyone experienced this problem before?
If the problem pointed directley to the heatsink fan, then I should at least get a few seconds of video on my LCD. I get nothing but, "NO VIDEO SIGNAL"

Thanks

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All Answers

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Are you getting the No Video Signal

by OH Smeg In reply to NO VIDEO SIGNAL

When you turn on the computer?

If so change the Power supply and provided that everything else is OK it will work.

I had a customer buy a New M'Board, CPU, Video Card, RAM and so on till he had replaced everything but the Case & PS. He then brought it in to be repaired and I replaced the PS under guarantee for him and he had what was effectively 2 working computers he just needed to buy another case & PS.

His reasoning however what that as the fans where running the PS was working but when I explained to him it only meant that the Fans where getting a nominal Voltage somewhere around 12 V and a unknown Current let alone the other Voltage Rails may not have been working at all I think he finally understood. It was a killer watching his face when I replaced the PS and it worked though.

Col

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Thank you

by dtaveras79 In reply to Are you getting the No Vi ...

Thanks for your suggestion. I will replace the PSU and see what happens.
Come to think of it, I do see that the fan on the PSU is spinning lightly, not with much enthusiasm.

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HeatSink

by Wizard-09 In reply to NO VIDEO SIGNAL

The heatsink needs the fan replaced, you wont run your computer very long without the heatsink fan not working.

How long does your computer stay on for after it is turned on, does it just shut down again.

Have you checked another LCD to check if its a monitor problem or not since you already checked the Video Card

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HeatSink

by dtaveras79 In reply to HeatSink

The computer stays on forever without shutting down.
The light on the Mobo turns on, the case fan spins, the PSU fan (spins lightly though) spins as well.
I have tried a working LCD monitor and I get the same message.

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Not the PSU

by dtaveras79 In reply to NO VIDEO SIGNAL

It's not the PSU.

I purchased a brand new 680W PSU and everything works the same way. The video card's fan spins, the case fan spins, the led lights up green on the mobo.

I guess my next step will be to purchase a brand new CPU fan???

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Try and swap what you like,

by ComputerCookie In reply to NO VIDEO SIGNAL

though if the Video card is OK as you claim then it should POST, unless there is a PSU or MB problem.

I suggest the MB may be your problem as it would shut down very quickly if the heatsink fan was not working!

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Clueless

by dtaveras79 In reply to Try and swap what you lik ...

Shouldn't the heatsink fan run even if the mobo is defective. Everything else seems to be spinning. I don't think it's the PSU since I replaced it with a brand new one.
I also replaced the video card with a brand new one. And I tried two working LCD monitors and still no video signal.
Even if the heatsink fan were to be defective, I should get a few seconds of video before the computer shuts down.
Would the CPU be defective???

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That is like asking how long is that bit of string in my pocket

by OH Smeg In reply to Clueless

But in answer to your questions

Shouldn't the heatsink fan run even if the mobo is defective

Maybe Maybe not depending on what has failed on the M'Board. For instance if some tracks have lifted or broken then not the fan shouldn't work. Here it really depends on what has happened and if the unit was pulled out of service when it started to give problems or if it was run till it died an early unnatural death.

For instance if the CPU Fan Failed and the owner went into BIOS and switched off the Alarm and ability of the M'Board circuity to protect the CPU an then ran it till it stopped then no it shouldn't work.

However if it was pulled out of service as soon as it started giving problems then you should just be looking at what failed initially.

Even if the heatsink fan were to be defective, I should get a few seconds of video before the computer shuts down.

Again this all depends on what has happened and how the unit was treated. It can also be part of the Make & Model of the CPU & M'Board here as well things like ECS which are complete junk do not offer the same level of protection that Gigabyte M'Boards do to the CPU's and RAM/

Also if this has an AMD CPU then the PS Failing would have taken out the M'Board, CPU maybe the HDD's and RAM. Just seems to be the way that things work with AMD CPU's where as a failing M'Board with an Intel CPU on it just tended to die without hurting the CPU. I'm sure that some Intel CPU's are destroyed when their M'Boards fail it's just that I haven't seen one yet. The same applies to AMD CPU's here as well I'm sure that there must be some AMD CPU's where the M'Board fails and doesn't affect the CPU but again I haven't seen an example of this yet.

Col

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Replaced the heatsink fan

by dtaveras79 In reply to That is like asking how l ...

I replaced the heatsink fan with a brand new one and the fan works now, although I still get NO video on the monitor.

The owner couldn't have gone into the BIOS since she is not computer savvy.

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Possible dead Mobo

by dtaveras79 In reply to Replaced the heatsink fan

OK, so it seems that the only componentleft to swap out is the MOBO.

I just tried using the CPU in question on my home computer (they have the same sockets LGA775 Socket for Intel)and it successfully booted up into Windows.

I don't see any burned capacitors on the Mobo, it's weird how it could have gone bad.

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