OK, I ran knoppix 5.1.0-en from cd and it worked great. I shut the system down and now my machine won't turn back on. Any ideas what could cause this?

Only thing I did before booting knoppix was change bios settings boot sequence to "boot from cdrom" as option 1 and boot from hd C as option 2. After logging knoppix off and removing cd I tried to restart the computer but it is frozen. I am stuck. It should have booted to windows right? Now it won't turn on at all. Everything was working fine prior to using knoppix live cd, during use of knoppix, but why won't the machine turn back on? It's driving me nuts.

system info:
Dell dimension 8110
Intel celeron 2.34ghz
windows xp home

Any help would be greatly appreciated