Computer wont start without unplugging/plugging in PC power cord?

[mookie]

Old power cord kept coming loose from PSU socket, resulting in "crackling" sounds, and PC being unable to boot unless i forced that bugger in and had something to hold the cord in place.

Managed to find a spare cord lying around, this one fits snugly but now my PC randomly hangs (youtube, gaming, doesn't matter). To make things better, CPU now refuses to boot until i pull out/plug in the power cord to the PSU. Mobo lights still glow, so i know power's getting through, but pressing the power button won't do jack until the above is done first.

Updated Nvidia drivers 2 days ago, but doubt it's responsible for this.

[Nehalem]

And you're on Windows 98?

[PieClock]

Sounds very similar to a problem I'm having at the minute, except I have to use another power cord for a a few days before the previous one works again.

[gman003-main]

Might be some weird ACPI thing, where the soft power button doesn't work to resume. Might even be some weird BIOS setting.

How old is your computer? I mean, you're showing as Windows 98, which is not exactly modern in any sense of the word, particularly with regard to ACPI support.

[mookie]

Com's on Windows 7 64bit OEM, and PSU's a Seasonic X series 760.