New Toshiba Netbook NB505 that I purchased for my wife yesterday evening. A few times the screen has gone blank. Once when I let it be idle for a few seconds. The most recent time while I was moving the mouse pointer. When the screen is blank, the computer still appears to be running. For instance, hitting the left shift several times causing beeping (as if I've started the sticky keys diaglog window.)
Pressing the power button a few times (tapping it, holding it down for 20 seconds, etc., does eventually bring it back to life.)
Sounds like it's broken and should be returned. But I wanted to check with others first.