System does not boot from hard disk drive, can be booted from floppy disk drive. Check cable running form disk to disk controller on the board. Re-install memory, make sure that all memory modules are installed in correct sockets. Check jumper and switch settings on display card. See display card section for information of settings.
Screen goes blank periodically.
Disable screen saver. Check keys again, if no improvement, replace keyboard. No color on screen. If possible, connect monitor to another system. If no color, replace monitor.