PC froze, user rebooted it and now when it comes up, the monitor remains blank. The light on the monitor remains amber, but there is a green light on the CPU and the keyboard. When the PC is booting, user says it is not making any of the normal booting sounds, everything is silent. The PC is an IBM PC 300PL and the monitor is an IBM E74M monitor. The user has tried unpluggeing and replugging everything. Please help. Thanks.