Black Screen

Your power supply might be the problem. Normally, you will encounter a black out monitor when your system cannot initialize properly, either because you have a loose card, board problems and power supply problems. try to replace your power supply (take note if its atx or at, and its wattage, usually i use between 230 to 300 watts power supplies), or it might need some cleaning. see if there is a heavy dirt build up inside (might cause the fan to stop). for a quick fix, you can disassemble old power supplies from your old pc's, make sure they have the same output wattage and see if it will work.

You might try resetting the CMOS, and installing a new battery.
If the system was un-plugged for a year, the battery may have run down.

Make sure that the CPU fan is running. Some MB's will shut down if the CPU fan is not running, or not providing the RPM signal to the MB.

Then, make sure that all cards and memory modules are seated properly.
Cycle any configuration dip swithes.
Double check all configuration jumpers.

Chas

Hello there,

There are at least 2 possible problems here.
.- You powersupply is somehow not working properly, I don't think this is the case since it starts then it goes down, but as a bet you can give it a try, just get another ATX powersupply,borrow it from a friend of your and test it.
.- The second one (which I think is the one) your ATX power on button on your mainboard is not ok or your mainboard is not ok. To find out if it is the problem just open your computer, look for the poweron button and make a short circuit on it, you can use a jumper, just make a short on it and remove it. If the system starts up it means that your power on located on the case is not ok, just fix it and it will work.
If the mainboard doesn't start up it means that your mainboard is not ok anymore.
I hope it helps, please e-mail me back if it doesn't work.

Regards,
@lberto
alberto@pancarib.com

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