I recently upgraded my hard drive, CPU and added a stick of RAM to bring my total up to 6GB. Now when I boot my computer, if I don't go into the BIOS and select the boot device, and manually select my hard drive, I will get a "Disk read error occurred. Press Ctrl+Alt+Del to restart" error on a black screen. If I do go into the BIOS and select the hard drive, everything works perfectly and there are no issues. I ran the Windows 7 disk check tool and it didn't find anything wrong, and as I recall it booted fine without going through the BIOS one time afterwards, but now I get that error unless I go through the BIOS.
At this point it's more an annoyance than anything else, since the computer boots and works fine when I go through the BIOS, but what can I do to fix this crazyness without having to reinstall Windows 7?