|EVERYTHING that plugs into the computer that plugs into AC, AND the cable that connects you to the internet, have to be plugged into something of decent quality that protects them from AC power surges or spikes. Many people may have the computer plugged into such, but not at least some of the other things. |
Even if you DO have everything protected as such, some things, such as lightning strikes, still get past the protection.
If your surge protection has a connected equipment warranty against damage, it is VOID if you didn't have everything protected, or if you used an extension cable between the anti- surge/spike device plug and the wall outlet, or, often, if you have protection by more than one brand.
Power outage events frequently damage the power supply. If you're fortunate, that's the only thing that has been damaged. If you're not, the mboard or some other component(s) may have been fried (if it was a lightning strike that caused the outage that's a lot more likely) .
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 it is failing, you can usually replace it with any decent 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 PS.
See response 3 in this:
Your power supply must have at least the minumum 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!)
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.
The following is about capcitors that were not made properly in the first place, but you may see the same damage from a power failure event:
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, Athlon cpu's, etc.:
Much less likely -
Examine the mboard and components inside the case to see if there's evidence of damage - scorch marks, carbon, damaged contacts on the ram or cards in a slot or in the slot when you remove them, damaged pins or cable connectors for drives when you remove the data and power cable connectors.