Thinkpad T20 problem?

The T20 was working fine then stalled. Rebooted, but now shows only BIOS page (black screen, white text). Seems to do some check of RAM then does nothing. Tried pressing F1 and F12 - says it's entering Setup but nothing happens. Tried booting from Recovery disc but doesn't appear to recognise the disc - nothing happens. It's an elderly T20 with a 12GB HDD and 256 MB of RAM, running on XP.

Paul