My keycool 87 is plugged into my computer via PS/2 (my usb cable is broken) and for some reason the keyboard only works in the BIOS.
I'm running windows 8.1 and Ubuntu 14.04 dual boot and it wont work in either. I dont have another PC to try it out on. This is literally my only keyboard.
I used the on screen keyboard to type this 
I don't understand this part:
[..] (my usb cable is broken) [..]
Can't you remove the ps/2 adapter and plug directly into a USB port?
If that doesn't work, can't you use a cell-phone USB cable instead, from your keyboard (yours has detachable cable, right?) just to see if the keboard is fine?
Is there a BIOS option in your motherboard to enable/disable PS/2 ports?
Cheers
.KeyHopper.