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Compaq Presario CDS 510 won't enter BIOS

Simone02

New Member
Joined
Sep 5, 2017
Messages
1
Location
Italy
Hello!
I've got an old Compaq PC (CDS 510) but it won't enter BIOS. When I press a key like F10, F1, F2, Del or other it says me:
Code:
301-Keyboard error
And I can't enter BIOS! I have got only one PS/2 keyboard. Help me please. Thanks in advance!
 
If they keyboard is plugged in (you didn't specify), It's probably the keyboard fuse. Not sure of that specific model, many used a small fuse that looks like a resistor. If you can find it, you can bypass it (temporarily) until you get a new fuse to install.
 
In CDS510 to enter BIOS Setup, you have to press F10 when it blinks a rectangle in upper-right corner of screen. Its on-ROM BIOS has "setup" enough to autodetect IDE drives and display error messages. No other things in its chip.
If it doesn't blink - no BIOS setup partition exists on hard disk. You need setup and diagnostics floppy disks to make one. Start with non-partitioned drive as it doesn't resize partitions.

Back to the keyboard: I assume that the keyboard is good. With multimeter check for +5V presence on PS/2 socket. This should uncover fuse problems. Connect keyboard to keyboard's socket, not one for mouse, they don't work in reverse.
 
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