Flashing power light?

Anyone have any ideas on what would cause my power light to flash on and off constantly? It happens about every 4-5 days, or if I leave the system on contiuously 3-4 days. To clear it, I have to unplug the power or switch the power supply switch off. System: 1000 mhz T-Bird, ECS K7S5a, (2) 256mg DDR 266mhz ram, Future Power 400w PSU,WD 30GB 7200 HD, USR 56k hardware modem, HP 9100 CDRW, Acer 50x CD-Rom, GeForce Pro 64mg, Diamond 300mx sound, system temp 27C, CPU temp 44C
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More about flashing power light
  1. that is what happens when the computer goes into sleep mode, or standby mode.
    or is it doing it during normal windows use?
    if it is, i dont know what is going on...

    -DAvid

    -Live, Learn, then build your own computer!-
  2. Everything is still running, it's just when the light starts flsshing, the system becomes unstable and/or locks up
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