Remove all hardware on the board , .clear cmos jumper , remove cmos bat , then discarge the capasitors
SOURCE: pover up trouble
sounds like something is drawing down on your 12 volt supply drives or on board regulators. Try it without the drives connectged, and see if you can get the system to boot up(you'll just get a notice that your drives are unavailable, but you'll already know that, right?
got backup for your Dell?
SOURCE: dell optiplex gx520 flashing yellow light on motherboard
According to the information you gave it seems it can still be the RAM. I've had a few PC's unable to startup due to bad memory.
Either that or the the front panel conectors are wrongly connected. Sometimes they do have a color code, but it's best to reference the manual. Can be the button . . .
If this is no help, I'd like to know more.
Flashing front powerlight is often a result of a faulty powersupply, try another powersully on the pc and see if the problem gets solved. I've seen a few of these cases personally.
One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA
the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
hope this helps
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