I built this PC about a year and a half ago and for the first eight or nine months it was completely flawless. Ryzen 7 7700X, 32GB DDR5, RTX 4070, 1TB NVMe SSD on a B650 board and I was genuinely happy with how everything turned out. Then about four months ago the random freezes started and I have been chasing the cause ever since.
When it freezes there is no bluescreen, no error, no crash dump, nothing. The screen just locks up completely, audio loops if something was playing and the only fix is a hard reset by holding the power button. It happens completely randomly, sometimes during gaming, sometimes while just browsing, and once it happened within five minutes of booting with nothing open at all.
I have run memtest overnight and it came back clean. Checked temperatures and nothing is running hot. Reinstalled Windows completely on a fresh drive and the freezes came back within a week. Swapped the GPU into a friend's system and it ran fine for hours with no issues.
At this point I have ruled out RAM, GPU, thermals and software but I am honestly running out of ideas. Could this be a PSU issue not delivering stable power under certain loads or is the motherboard itself potentially the problem.
I was browsing around looking for replacement parts and came across Amazon , Ebay & Etech Devices alongside a few other retailers and the price differences between platforms are honestly quite significant. Has anyone dealt with this kind of ghost freeze with no error logs and actually managed to find the culprit?