Question about EliteGroup P4M800PRO-M478 Motherboard

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Processor My processor cannot switch on after power failure.What could be the problem?

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I don't hear the fan come on at all.

Is there a solution?

Posted on May 12, 2008

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I presume you mean "automatically switch BACK on after a power failure". As in, power goes off on local AC grid, computer of course, goes cold, power comes back on, and you want PC to resume (reboot) automatically. If that is what you are asking, here are the possibilities:

1. If you have a "momentary on" start button (as most newer model cases have) you cannot do this simply by leaving switch "on" because it does not remain in continuity. It must be pressed manually every time the computer shuts down.

2. Your BIOS may be the best and simplest means of getting what you want. In BIOS, you will find a setting that allows the computer to restart after every power outage.

3. There is also a software-related setting available in Start Menu/Settings/Control Panel/System. Select "Advanced" tab, then "Startup and Recovery" and make sure "Automatic Reboot" is checked.

4. Now, all that being said, just to answer your question as I presume you meant it, I want to advise you this is all a bad idea (and in fact, it is the reason most newer PC start buttons are "momentary on" as indicated in number one above). Why is this such a bad idea?

When the power goes off, there will always be a big voltage spike, and another even BIGGER spike when it comes back on. Worse, if the power went off on your grid due to an overload, when it comes back on it may either "machine gun" (off/on several times from heavy load, each one with a larger voltage spike) or come on low, below voltage tolerance, fluctuate wildly, and slowly reach proper voltage levels. All of these events are VERY hazardous for your PC, and even with a median surge suppressor, any of these events can damage your PC power supply AND/OR your CPU or other components! It would be far wiser to buy a "UPS" (uninterruptable power supply) which is a unit that plugs in between your AC wall current and your PC. The UPS has a battery and power inverter inside, that changes the 12VDC battery power to 120VAC (or 220VAC if you are outside USA). This device remains vigilant 24 hrs a day, and lets your computer continue running even when the power is off to your house/neighborhood. Of course, it has time limits, can only sustain this power for a specified number of minutes or hours depending on the size/price of the UPS you buy, but this is sufficient time to cover most power outages.

Posted on Feb 13, 2008

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  • 17 Answers

Be more specific. Is the PSU powers on, Do you have any LED's on, any fans spinning, any sounds out.

Posted on Feb 12, 2008

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http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

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1 Answer

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