Power Outage

January 23, 2010 at 15:47:23
Specs: Windows XP sp3
Our neighborhood lost power for about half an hour. My HP Media Center PC m7160n and a monitor were plugged into a surge protector of good quality. My monitor powers on but not the PC. I switched ac power cables, changed power outlets, surge strips, plugged straight into the wall outlet, pressed the power button until the green light on the back quit blinking then tried re-plugging in and starting up = to no avail. In addition, as soon as I reconnect the power, the green light starts blinking. I've held the power button on until the light stopped, then held it for another minute, but when plugged in = still no power up and it starts blinking again. I haven't added anything new or changed any of the configurations. Any advice would be greatly appreciated as I am unemployed and have limited funds. Thanks in advance!

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January 23, 2010 at 15:57:21
When I posted that msg, a very similar situation appeared on the webpage that did not reveal itself during two searches on this site. I have access to several other computers, Dells and what-not but have no clue as to "switching out" PSU's. Will continue to search online. Sorry if my post on that particular topic one all too repetitive.

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January 23, 2010 at 16:02:14
Did you try to reset the bios (by the jumper)? One of my friend had similar issue and resetting the bios worked.

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January 23, 2010 at 16:11:52
have found how to reset CMOS but not BIOS...yet
ALSO, found media on replacing PSU, if anyone else needs it: http://h10025.www1.hp.com/ewfrf/wc/...

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Related Solutions

January 23, 2010 at 16:13:33
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.

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January 23, 2010 at 16:14:37
"have found how to reset CMOS but not BIOS...yet"

It's the same thing.

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January 23, 2010 at 16:34:15
The bios on mboards has two parts - a ROM (read only memory) part that you can't access, that does not require a battery to retain it's data, and a Cmos part that you can access part of in the bios Setup that retains the time and date and sometimes user specified settings, that requires a battery to retain the data.

A power failure event can damage the bios in some rare cases, but removing it's battery on the mboard, replacing it, or moving a jumper on the mboard to clear the Cmos, replacing it, will almost NEVER help for your symptoms.

You could also try re-seating everything inside the case - un-plug, plug back in, with the AC to the case disconnected or switched off - sometimes a power failure event makes some of the connections iffy.

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January 23, 2010 at 16:37:42
"Did you try to reset the bios (by the jumper)? One of my friend had similar issue and resetting the bios worked."

Have yet to find a manual work-around for the BIOS = everything I've found references it in the setup utility program aspect

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January 23, 2010 at 16:42:41
Apparently, I'ma juz toooo ignrant 4 ma oan gud. Will look at all this Stuff again tomorrow. Thnx Y'all for the help.

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