That's a little on the dusty side. The 4DX2-66V is essentially a 4DX2-66E with the power buttons on top instead of in the middle.
That power supply looks like a TANK, I bet its vastly UNDER rated, not like PS's these days that are vastly OVER rated, I bet that 220 watt could handle a 300 watt load better than a cheap 400 watt found in some modern machines, lol.to me that power supply is a gem. gotta love the first "brand" of power supply to actually have a notion of quality.
Here's part four of Removing yellowing from plastics. It also has links to the other parts.What's a good way to remove the yellowing from the plastic?