neighbour has an old toshiba laptop.... two problems are showing up 1. Intermittently on power on it will boot to a black screen -- sometime 2 or more restarts are required to get "bios" screen for bios access to appear. 2. When it does boot through bios screen it will start to load Win 7 and after perhaps a minute or so re-boot itself and start over again. (i have never seen it boot to black screen here). What i have tried.... 1. Attempted to reload Windows 7. a. system seems to boot fine from dvd and steps through setup for windows 7. i formated hdd during this process however when install gets to unpacking files etc it generally reboots itself . 2. Changed the hdd - system properly seems to recognize the new hdd 3. Updated BIOS to latest version i could find - ver 2.2 4. Cleared Cmos . 5. Reseated Processor. 6. Obviously cleaned inside of laptop while i had it apart as well. (wasnt really all that bad with dust etc.) Seems to boot and run ok from DVD..... have run Ubantu test disks - memory test.... ran for four hours with no system self reboot. It will not load linux from these disks however....system reboots system reboot seems to be happening when I/O to HDD is attempted. i have had a look through hardware here and google but cant find much relating to this problem any ideas anyone could suggest would be appreciated When bios screen does appear it is accessable and entries can be changed as desired.