I run across this with a few laptops that hang on boot when USB things are plugged in.
Try the usual:
1. Unplug all USB things.
2. The generic reset noted in this forum. The short version is power off, remove AC, battery then press and hold the power button for 60 seconds. Release, slip in battery, apply AC and try again.
Looking at a Toshiba laptop running Windows 7 Home Premium. When you turn it on, it boots straight to a black screen. It doesn't seem to even load BIOS. I tried holding either F1, F2 or F10 during boot up attempts trying to get to a diagnostic mode with no luck. I'm thinking it could be a problem with the system board. Any suggestions?