I am not sure if I should hijack someone else's thread or start one. I decided I will start one.
Problem: Decide to build an AMD Fusion based desktop. I have a A8-3850 APU mounted on to the GA-A75M-D2H. Corsair CX-430 PSU. 8GB Corsair Vengeance DDR3-1600 1.5 V RAM.
I have already mounted the motherboard inside the case. After connecting the front panel usb and power pin connectors, I turned ON the power to PSU and then the power button on the case. But the computer does not turn ON. No beeps either. I see the PSU fan and the CPU cooler fan spin for a second and then stop. It does not even POST!
I looked around and found this trouble shooting guide:
So I disconnected everything and set it up outside the case. Then tried to power up the motherboard outside the case and also shorting the power pins using a flat head screw driver. As before I see the PSU fan and the CPU fan spin up. After a second, it stops.
1. So its not because the 4 pin connector or the 24 pin connector not being connected
2. Its not the standup screws causing a short by bad mounting either, since I tried outside the case.
3. No graphics card.
4. I tried removing the RAM too and also without any ram. Same result.
5. CPU yes, it is mounted properly. I did not use any after market cooler neither did I use any other thermal paste. I used the thermal paste/ substance on the cooler as it came!
6. CPU fan is plugged in as I see it spin for a sec.
I've been having similar boot issues. I found this other thread which says that the PSU is having issues detecting enough power draw on boot. I stuffed a PCI card in (WinTV PVR-250) and that seemed to do the trick. I wish Corsair would just come up with a more elegant solution though, since I can't actually fit that card in the low-profile case.