Its on a IBM T43 laptop. and if I leave it alone for awhile, it starts fine but if I shut it down, it won't start again. Then if I leave it for awhile it starts up again! But if I leave it in stand by mode, it will start fine when I go back to it. I have switched out the hard drive, taken out the optical drive and the battery one at a time, but with the same result, it won't start until its ready.

Is the computer heating up?

Is the computer heating up?

no it won't even start

Try Booting with only the Ac Power remove the battery

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