Dead pc, green LED on motherboard flashes

I unplugged my pc of before a thunderstorm last night. This morning, it won't turn on! No sign of life, completely dead. When I look at the motherboard and turn it on, a green LED flashes evenly every half second. Any ideas?
metalaureateAsked:
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ShrColCommented:
Power the machine off at the wall socket leaving the cable connected. Hold the power button on the machine in for 20 seconds or so. Release the power button, switch the mains power back on and try it again.

Sometimes power supply units get into an odd state, that may clear it.
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metalaureateAuthor Commented:
Alas, no. Motherboard LED still blinking and no life.
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ShrColCommented:
Do you have another PSU that you can try? If not you could try removing power from all components in the machine apart from the mainboard to see if its one of them causing the problem.
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metalaureateAuthor Commented:
I'll try that. What does the flashing green LED mean?
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ShrColCommented:
Depends on the motherboard. The manual might tell you more, check the manufacturers website for it.
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E-Z-PCCommented:
Did you unplug any network/telephone cable you may have had plugged in to it?

It is sounding like the power circuit on your MOBO has given up. It isn't supplying any/enough power to components to start-up.

A spike in the telephone line/network cable may have affected it. If not, it could equally be a coincidence that your motherboard has decided to give up, just as a storm hits.
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metalaureateAuthor Commented:
Er, no. :(

I don't have a spare power supply. Should I go out and buy a replacement and see if that fixes it?
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ShrColCommented:
It might well be the power supply but it could also be the mainboard. I wouldn't want you to waste money on the wrong part. You could buy one but make sure you can return it if its not needed first.
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E-Z-PCCommented:
That's probably the best idea at the moment. Or perhaps borrow one from a friend for an afternoon. That way, you can eliminate/identify the PSU as the problem.

The light shows that there is power to the board, but with nothing else starting up, it tells us that either:

1)your power supply is unable to distribute the correct voltage 5v, 7v, 12v etc to the baord components
or
2) your power supply works, but the power distribution circuit on your mobo is not working.

I hope, for your wallet, it's number 1.
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metalaureateAuthor Commented:
Thanks - I'll go try those things and get back to you.
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Alex_WCommented:
As mentioned - check your motherboard manual for LED message, sounds like the PSU but I recently had a graphics card go which stopped my PC booting all together - LED flash but no further.

Try replacing different parts with any spares you have or can get hold of, i.e. memory, video card, PSU.  Once my PSU surged my memory and because I had limited spares I had to bite the bullet and pay a computer shop to test with all their spares - so I could at least get it narrowed down to the component at fault.
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metalaureateAuthor Commented:
Thanks - it was the PSu. But in removing, I had remove the CPU heat sink, and in the process detached the CPU by accident, and bent the pins trying to get it back in. I then had to by a new motherboard because an AM2 is really too old, which in turn required new memory...
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