Protech Systems PROX-1750 User Manual page 100

Keyboard error or no keyboard present :
Cannot initialize the keyboard. Make sure the keyboard is attached
correctly and no keys are being pressed during the boot.
Manufacturing POST loop :
System will repeat POST procedure infinitely while the P15 of keyboard
controller is pull low. This is also used for M/B burn in test.
BIOS ROM checksum error – System halted :
The checksum of ROM address F0000H-FFFFFH is bad.
Memory test fail :
BIOS reports the memory test fail if the onboard memory is tested error.
Prox-1750G1/G2 USER
'
S MANUAL
Appendix C Trouble Shooting
Page: C-7