It could be any of a number of things given the advanced age of the system -- bad cold solder joint somewhere would be prime among them.
You will also find these selling for $100-150 used, complete and working -- compare the prices on Ebay, etc. for complete systems (which then gives you a set of parts like the power supply, etc. to keep in reserve).
ejn63
12 Elder
•
31664 Posts
•
155731 Points
0
0
Posted November 23rd, 2025 15:23
The solution is a replacement mainboard -- they're not expensive (starting under $30).