computer power led flashing green light

January 4, 2010 at 06:53:21
Specs: Windows XP
The only thing I get on my CPU is a blinking green light. It won't turn on or off, won't start, and doesn't do anything else. I removed the power cord from the back of the computer and it took a few minutes for the green light to stop blinking but it finally did. When I reconnected the power cord, I get the same green blinking light. Any ideas?

See More: computer power led flashing green light

January 4, 2010 at 07:44:24

Remove the power cord, (and main battery for laptops)
Hold the ON button in for 20secs (dispersing internal power)
Put the power cord securely back in, and turn on

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March 31, 2010 at 14:23:27
In diagnosing same problem for a friend's Compaq Presario P8657E, have learned that apparently the blinking power supply LED light indicates a problem with the power supply or a component. Not going off after unplugging is due to the residual capacitance (circuits that act like tiny batteries) that's enough to power the LED for a few seconds.

These are the best diagnostics I've found

In brief, it looks like a steady light means all is well and flashing light means there's a problem.

Disconnect EVERYTHING from the motherboard, including the main power connector, then plug the power cord back in to the power supply. Light should not flash.

Unplug power, plug internal power connector from the power supply (PSU) for one peripheral in. Plug in power. If light flickers a little then comes on steady, component is okay.

Repeat with each component. If the LED flashes instead of going steady on, that component has a problem.

The last connector to try is the main motherboard connector (P1). That's where mine started flashing. I thus conclude the motherboard was fried by the power outage.

Hope this helps.

If anyone has different results, please post. I could have misinterpreted something.

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