computer starting but no video signal

March 30, 2011 at 13:26:24
Specs: Windows 7
Was playing WoW (the computer's been playing it for years) and suddenly the computer just shut down, powered it on again and the fans went nuts and my monitors were not receiving any video output from my computer. I've been looking around and I see a lot of similar situations, all with very different answers. I know it's not the monitors, because I plugged in one from another computer along with its cord and it still didn't get a signal. I replaced the video card as well with an older one I used to have in the computer that I upgraded from, and the fans were fine so I know it was only the other video card's fan going nuts, not the CPU's. I will get specs up later. I would appreciate any assistance you guys can offer. Thank you =)

I have tried taking everything out except for the bare minimum (CPU, PSU, and 1 stick of memory) and still nothing.

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March 30, 2011 at 23:47:37
Try replacing you monitor. CRT monitors are likely vulnerable to heat-up due to overuse, LCD on the other hand, has the upper hand to take excessive amount of heat due to prolong use.

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March 31, 2011 at 06:41:42
When your symptoms include no video, usually there is nothing wrong with the monitor or the video adapter - something else is wrong.

If you have not been fiddling with the ram installed in the mboard, and have not moved the computer from one place to another, just before this happened, then the most likely thing is....

Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:

If you can borrow a power supply from another working computer, try connecting that.

If it is failing, you can usually replace it with any decent quality standard sized standard ATX PS with the same capacity or greater.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo (in quality) PS.
See response 3 in this:

Note - I may have mentioned Coolermaster in that - I have recently found some models have only a 1 year warranty, some are known to have premature fan failures.

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.

If you need to get a PS with more capacity, you can usually replace it with any decent quality standard sized standard ATX PS.

This is less likely but if you have this problem it can cause all sorts of symptoms.....

If your mboard is not new (usually the mboard is at least 2 years old when this happens)......

Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:

What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.

Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.:

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