Device fails to power on via the power switch.
Device fails to power on via the power switch.
Let's review your setup and the steps you've taken. Here’s a concise summary:
Your system specs:
- Intel i5 2500K
- 8GB DDR3 RAM at 1600MHz
- 2ABF 24-pin CPU power connector
- Advance MPT 5002 PSU (500W, non-modular)
What happened:
- The PC worked fine until yesterday.
- You tried several fixes: removing the motherboard, testing the PSU with a paperclip, disconnecting the 24-pin only, and even using a metal pen.
- Still no power or boot issue.
Possible causes:
- Loose or faulty power connection
- Corroded or damaged connectors
- Faulty CMOS battery or motherboard issue
- Insufficient power supply capacity
What you should check next:
- Verify all connections are secure, especially the 24-pin.
- Try a different PSU if possible.
- Test with a known-good PSU to rule out hardware failure.
Let me know if you need help troubleshooting further!
Yes, I noted that attempting to power on with the 24-pin plugged in didn’t work. I tried shacking and wiggling it, but nothing changed. After unplugging the 24-pin, I kept the 12V from the EPS 4-pin connected and used a paper clip to activate the PSU from the 24-pin. Then the CPU and PSU fans started spinning, and the case lit up briefly, but plugging back in the 24-pin didn’t result in any action. Note: I experienced some random shutdowns about two days ago, where the PC would power off and restart without warning. What might be causing this issue?
The PSU appears to be functioning properly by connecting the power on pin to ground and ensuring the motherboard power switches are correctly engaged. If this doesn't resolve the issue, there may be a gap in the switch trace or a short circuit on the motherboard that the PSU is sensing. This suggests a problem with either the PSU or the motherboard itself. Try using a different PSU to test.
I will test with a different PSU and send you an update. However, you mentioned the issue is with the motherboard. If it's a motherboard problem, why would the CPU fan run normally at full speed until I remove the paper clip from the PSU? Do you think the PSU is the cause? As I've said before, I only connected the EPS 4-pin 12V to the motherboard and left the 24-pin plugged in. That means no power reaching the Power SW pins on the motherboard and the PC case. II) When only the 4-pin 12V is plugged in and the 24-pin is unplugged, the system powers on, the CPU fan spins, and everything works normally.
Please verify using a reliable power supply first. Otherwise, it might be a motherboard problem, though I’m very unsure.