I have a Toshiba L450d which starts with a Blank Screen. If I remove and re-fit the hard drive it fires into life, but once powered off for more than half an hour or so it seems to start with a blank screen again. In the fail condition, the CPU fan is running but there is no display. Ive tried removal and refittement of battery and ram but it would seem the only reliable way to restart from the condition is to pull the hard out the hard disk for a few minutes and re-fit. Once the computer does switch on correctly it works a treat. I hope this is a connection or a flakey hard disk issue - Any ideas anyone ?