Title kinda tells it all! I can boot off of CD. I ran UBCD and did samsung hdd tests (1 short, 1 extended with full scan, another short) The first time I tried the full scan it got to 8% and started failing for 20-30 minutes so I rebooted and restarted the test and ran for 2.5 hrs or so and came back clean, then another short one came clean.
I boot of win7 disk and I can install it, it sees previous win7 install so creates windows.old, then when its complete installing for the reboot it will either A> boot off of disk and re-start the install, B> boot off of hdd and get black flashing cursor.
Ran CPU stress tests and memory tests and all was clean.
Prior to these tests win7 would boot, had some malware/root kits I took off and cleaned things up a bit but still noticed OS jacked up (completely freezing up, no ctrl alt del, no bsod - nothing too substantial in the event viewer). At one point chkdsk wanted to run and it fixed some issues.
After tests running it stopped booting and giving me the black cursor. Bios and everything was up to date - the bios on this is really basic (sony vpceb42fx)