- Total Post: 11368
- Jedi Master
I did a search and this can only be 2 different reasons.
1. the logicboard is defect
2. the power supply is not working correct.
As the first issue is not trivial to test or repair, the second is easily to test.
Take a power supply from a 100% working unit and test with your failing one. Although the failing power supply is giving power to the unit, it could be that it is no longer delivering enough power. These old power supplies are dying over the years and I have seen that several times with my customers (although other issues than yours have arised there).