Z440 Desktop - Cannot get into Boot menu

[servo75]

@ItIsMyName I did try booting from a regular USB (non-bluetooth) keyboard and no difference.

I found that I could get the system to recognize F12. However, I got the same message about "Media Test Failed, check cable." Of course I have no network boot, and if I press nothing it boots normally off the hard drive into Windows so I don't understand. It's almost as if the machine is saying, "Well, there's no network boot and my instructions are to boot from network ONLY, so I refuse to go into Boot or BIOS settings at all! However, if you restart me and do nothing, I'll boot off your hard drive into Windows." That makes no sense.

Basically what happens with ESC, F9, or F10 is that I get the screen that says "Intel Boot Agent GE 1.5.50" but then the boot process halts and I have to C-A-D to re-start normally.

I didn't want to have to try your solution about disconnecting the hard drive but I may have no other choice, because I'm basically at my wits end. it's clear to me that something in either the BIOS or the Intel Boot Agent is screwy. I bought the machine refurbished about a year ago. Perhaps it was once connected to a corporate or school network with network startup and the BIOS was never reset before they sold it. If I could reset that or update it, it may solve the issues. Right now it seems to recognize the F10 keypress (I know this because it recognized F12) but I never get that prompt to enter BIOS, the boot process halts before that happens. If I C-A-D and do nothing then it boots into Windows hunky-dory as if everything's fine.