1. Heat. Do your yearly air blast on the vents with canned air and hope it dislodges a hairball.
2. Boot SAFE MODE and see if the power profile is set to something odd like shutdown at 99% battery reserve.
Dell Inspiron 1545 shuts down unexpectedly
I have the Dell Inspiron 1545 with the Windows Vista Operating System. It loads windows just fine. After about 1 minute or less, it will just cut off. This happen with battery power or with the AC power plugged in. I booted into safe mode once and it seemed stable, but it even cut off even then. Not sure what the problem is. Any suggestions?