I have an old Dell OptiPlex GXi 5166L that I want to put Red Hat on. The problem is that it won't boot from the CD-ROM so I need to change the boot devices in the BIOS. However, I can't get into it. I've tried every key I can think off but nothing works.

Thanks for any help.

Dell's typically use the F2 key to enter setup.

Tried that and all it does is beeps. Tried Del, Esc, Ctrl, all F keys etc.

I have a Dell optiplex gs and you have to press at thie boot secance
"ctrl-alt-enter" to enter the bios