The screen shows this as white text on black background, occasionally on start up:
Windows Boot Manager
Choose an operating system to start, or press TAB to select a tool:
(Use the arrow keys to highlight your choice, then press ENTER.)
Microsoft Windows Vista (this was highlighted)
To specify an advanced option for this choice, press F8.
Ramdisk Device Options
Windows Memory Diagnostic
This afternoon when the screen came up upon start up, the keyboard would not do anything. Pressing Enter did nothing, but computer would not respond to keypresses, so Windows did not start; just the same Boot Manager screen remained unchanged; so I turned OFF the computer, disconnected from power, pressed and held power button to drain all charge, waited two minutes more, and then reconnected, and did fresh computer start and found no trouble since - still in current usage session.
I wish I knew how to understand and investigate this in some meaningful way.
Windows Vista, laptop-Toshiba, T5550 processor, 3072 RAM, 200 GB Hard Drive, 802.11 a/b/g wireless internet connection. What else needed?
Edited by cafejose, 26 November 2012 - 07:21 PM.