My niece's Toshiba laptop refuses to boot. Most of the time it does not even show the first boot screen, the one that says "Press F2 for setup, F12 for boot menu". Instead it just has a blank screen and the fan runs very fast. On very rare occasions, it will get to that first boot screen, and one time when it did I booted off the Windows 7 repair cd and ran chkdsk /r from the command line. It found no errors. I also ran the Windows Memory Diagnostic, it found no errors.
Any ideas what to try next?