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Toshiba Satellite 2800 bios question

I have updated the bios on a friends Toshiba Satellite 2800 and it works fine, however the computer is turning itself off after about 5-10 minutes and needs the power button held down to turn on again and the user logging again. Previously moving the mouse logged back in.
On my own machine I can access the bios settings when tuening on the machine by holding down the F2 key. I cannot find a similiar setting for the Toshiba.
Any ideas?
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Commented:
In BIOS you need to disable Power Management and also select Instant Off with Power Button.

Try the following keys to enter setup (I'll continue to look for others):

F1, F2, F10, Delete, or CONTROL-ALT-ESC

Commented:
Also try just the Escape key.

Commented:
Here's a list of other keys that can be tried. This list was provided in an earlier question from the great Expert, trekie 1. I keep it handy for questions like this.

try some of these
Press Delete during boot = AMI, Award BIOS
Press Esc during boot = Toshiba
Press F1 during boot = Toshiba; Phoenix; Late model PS/1 Value Point and 330s
Press F10 when cursor junps to top right-hand corner of screen = Compaq
Press F10 when logo screen is displayed = Compaq
Press F2 during boot = NEC
Press Insert during boot = IBM PS/2 with reference partition
Press Tab during boot = Emachine
Press reset button twice = some Dells
Press Ctrl Alt + = Misc computers
Press Ctrl Alt ? = Some PS/2s, such as 75 and 90
Press Ctrl Alt Enter = Dell
Press Ctrl Alt Esc = AST Advantage, Award, Tandon
Press Ctrl Alt Ins = Zenith, Phoenix
Press Ctrl Alt S = Phoenix
Press Ctrl Alt Shift + Num Pad Del = Olivetti PC Pro
Press Ctrl Esc = Misc computers
Press Ctrl Ins = some PS/2s when pointer at top right of screen
Press Ctrl S = Phoenix
Press Ctrl Shift Esc = Tandon 386

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