Check LEDs for CPU A located at D9, D10 and D11. See memory specification above. Please re-seat memory and Slot B modules. Incorrect jumper configuration. Incorrect memory configuration.
Ensure keyboard is plugged into the proper port.
This will be the connector closest to the motherboard. In a CH320 Chassis the Halt switch is a button toggle switch. HALT stays on until the button is pressed a second time. Try pressing the Halt button ONCE and power cycle the machine or disconnect the halt cable from the board while troubleshooting. There is a complete SRM How-to available here .