To my mind, I've ruled out everything but CPU and/or MoBo death, but. I took a few pictures of the board, socket and CPU, which I might upload in a little bit. Removed, inspected and reseated CPU and MoBo - No obvious signs of damage that I can see. Tried previous known working PSU with just MoBo, CPU and 1 stick RAM Tried various RAM sticks solo in different slots. Pulled ALL RAM - got POST beeps to say there's no RAM Pulled all but 1 stick of RAM - just MoBo, CPU and 1 stick RAM Pulled the RX480 - for Hackintosh, iGPU is turned on anyway Occasionally it will POST and display a Gigabyte-esque screen on a connected monitor then shut off seconds later. 5-10 seconds later, it's turn off without a POST beep and spin up again after a moment. The PC will now light up the power button, spin up the two case fans and CPU fan will spin for a second before stopping. Capture card is a BlackMagic Intensity 4K installed last night. Occasional graphical glitches/hard crashes made me think to replace the 3yr old PSU (Novatech store branded 550W) when the EVGA went cheap on black friday, and had 5 days of solid running since.

R9 280X replaced by RX480 in early October. I'm trying to remember, but I'm 99% sure I did what I always do, flipping the PSU switch, pulling the cable and touching the metal case to dissipate static, like I always do.Ĭore i5 3570K, Gigabyte Z77-D3H, 16GB DDR3 RAM (2x4GB HyperX Beast, 2x4GB Crucial Ballistix Sport), EVGA GS 550W, AMD RX480 8GB All of this started yesterday when I installed a PCIe capture card, and it's been perfectly fine since I built it in the middle of 2013. My PC is a bit screwed right now, it struggles to POST, and I'm fearing that MoBo and/or CPU are just dead.

So I'd like a 2nd/3rd/37th opinion on this. I've changed the title so this should hopefully be useful for anyone with the same boot loop issue in future. Update: SOLVED! Thanks for the suggestions, I'm back up and running after triggering the BIOS backup restore by holding power and reset for 10 seconds. Building a CustoMac Hackintosh: Buyer's Guide

Macbook pro 3 beeps on occasional