My friend and I just finished checking voltages, and the PSU seems working fine.
Pink: 3.4V Brown: 5.2V Blue: 11.9V Red: 23.9V Grey: 0.013V
There actually was not so much dropping before and after the fuse board. I reseated the RAM card once again before I close the back panel and wala! screen came back again.
Then, we came back to the wall outlet and check the ground-neutral voltage. It reads 0.5V when cooler is idle and spikes up to 2.8~3.4V
when cooler starts running and stays at around 0.8~0.9V while motor is running. Definitely not a good environment for a copier. My friend is brining a special device to resolve this issue. We decided not to turn it on until the power outlet gets prepared.
Thanks again for your help! I almost ordered a PSU.
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