my toshiba portege m900 shuts down the moment windows starts loading AND this only happens during the first boot up for the day. details: in the morning, i turn it on, first time it was turned on for the day, then the moment windows starts loading (vista - loading bar / windows 7 - when the windows logo shines) then it will shutdown completely. when i turn it again, it will now proceed to loading windows (of course i get the error that windows was not shutdown properly, blah blah...... so i just select "start normally" then ok), then i can use my laptop normally. i doubt it's a software issue since the same thing happened when on windows 7 and when on the default OS vista (i ran factory recovery to see if it helps but same problem happened). i also ran memtest and ran diagnostics on the HDD using seatools, but found no errors... i think it's with a certain hardware device somewhere/somehow and when windows loads the driver for that particular device, it crashes the whole system... by the way, it won't shut down when i boot in to safe mode only even if it's first start up for the day... the big question now is which hardware is most likely at fault here... appreciate your inputs guys... thanks!!