Yep

I'd read about it...and now I know about it.

It's a very strange thing IMO...

Cleared CMOS installed XP restarted Hung no POST

no POST, no monitor...just C1 code.

On starting from powering up I get 88 C1 25 26 then it shuts down and restarts automatically and I get C1 and that's it...

The only hardware I have changed is the Hard-Drive. I've tried three other hard drives.