Well, shit.
Here's what I did:
Couple of days ago I fired up ye olde desktop for the first time in months.
Installed a Chinese language WinXP on ye olde desktop. It worked fine.
Then I got hot for Windows 7. By accident. I had no idea it had just been released.
Anyway, I got me a retail version of Windows 7 Home Premium burned to disk.
I booted ye olde desktop with this Windows 7 install disk.
From that Windows 7 install disk, I deleted the XP partition, and then...
Successfully installed Windows 7.
It's pretty. It looks a little bit crap on ye olde desktop because ye olde GPU won't go quite high enough in screen resolution to get a good screen. But still, it's pretty. So, I decided to get cocky. What I wanted was to mimic on the desktop the state of my laptop, namely, a 20 Gb primary partition containing Win XP (upon which Windows 7 could be inflicted in a dual boot scenario). So...
I popped ye olde Win XP install disk into ye olde desktop, rebooted, and using ye olde Win XP install disk, I deleted the Windows 7 partition... both of them. Yes, there's two. A tiny hidden primary and a normal big, I guess also, primary. The little one is a system partition of some kind.
And that's where it all went to shit.
I don't know how to make the Win XP install cd join up to adjacent unpartitioned spaces. If I did, I would, because the primary unallocated space part is only 16Gb, not enough for XP and 7.
So... I halted the re-installation of Win XP, took out the disk, and went in search online for some bootable partitioning tool. I found a few. Makes no difference though. Because ye olde desktop no longer boots. It gets as far as detecting the HD, the CD/DVD, and something about the HD, and then it stops.
Can't boot a CD. Can't get into BIOS. The computer is now a large, noisy paper weight.
I wish to blame Windows 7. But it probably has nothing to do with Windows 7. Probably my own screw up. Somehow.
Fuck.