[sugy]

My computer running XP powers up without problem when the system is previously powered down using XP. However, if the power supply is removed and returned, it can take days or weeks of trying before the system will power up. The power switch to the motherboard produces no reaction whatsoever in the system until it finally returns to normal. Any advice would be greatly appreciated.

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Perhaps your power supply is on its way out and needs to be replaced.

[Facedown98]

Perhaps your power supply is on its way out and needs to be replaced.

[Longhorns242]

sounds like PSU is going dead.

[sugy]

Thanks for your advice. I had discounted the possibility of a failing PSU because the system powers up via the power switch without any problem after an XP power down. Perhaps it is more of a struggle for the PSU following an external power shutdown. I shall now move towards changing the PSU.

[sugy]

As a postscript to this, I can report that I jump-started the PSU and it was found to be working normally. The problem turned out to be the 20-pin socket which needed resoldering