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can anyone help me , i have a pc on which someone has set a bios password and can not remember it . is it possible to bypass it. i am quiet prepaired to rebuild my machine from start

Sure, there are several ways to bypass it:

Reverse the motherboard battery for 5 seconds to erase the CMOS memory.

Use the backdoor password (I know that for some machines it's "AMI", but that's the only one I know).

Those are the only ways I can think of offhand.

(is there a list of BIOS backdoor passwords out there somewhere?)

rather than mess with the battery there is a simple jumper you set and turn on the machine, then turn off, restore it org. pos. and turn it on once more.
for futher qestions go look in the manufactures web site or in you doc.

VoidLogic