Wont boot. Bad PSU and overheating issue

RibletRoblet · January 16, 2020

PSU 750W 80 Plus Bronze

Intel Core i5-4670K Haswell Quad-Core 3.4 GHz

G.SKILL Sniper Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900)

2 SATA SSD drives and 1 5400rpm SATA hard drives

XFX Radeon RX 570 4GB

Windows 10

My computer will not power on. When I hit power button all the fans will start up for half a second, and then shut down. Then 2 seconds later it will try and start again but continues to shut down after a half a second. This happened to me a month ago and I figured out that the small 4 pin connector for the main Power Supply to the motherboard had popped out. Plugging it back in fixed everything. So naturally this time I checked to make sure all the power connections were secure. Still keeps shutting down.

Some things in that have also been happening that may or may not be related. The computer has always run very hot. 2 case fans died like a year ago and I never replaced it. My machine still ran fine but every now and then when restarting it would show error cpu overheat, and would not boot windows. I replaced the case fans recently with one very large one on the side panel and 2 standard sized ones for the top. I am confused about which way to orient them. The airflow seems to be blowing up, out of the case. Wondering if that is correct.

A few weeks ago my system began running very sluggishly. Like every minute or so there would be like 3-5 seconds of lag, where the mouse cursor would freeze or move very slowly, then catch up in 5 seconds. Same with typing and dragging windows, it would freeze and then refresh 5 seconds later. I tried re-installing windows and that seemed to work for a few days but then after a few days of watching a lot of movies it started doing it again. So I think this is probably the system getting too hot?? Because every time it did that I would restart and I'd get the same CPU temperature overheta message on the boot screen. I don't remember the actual temperatures, like 70 celsius maybe.

So there seems to be 2 separate issues. A power supply issue and a cooling issue. I plan on getting a better heat sink since the one I have is the one that came with the CPU and is a very low profile sink. Thinking of getting a much larger one, l hear Noctua is a good brand. I just bought my power supply like a year ago though. So I dunno if that is the problem or how to test it without just buying a new one and seeing if it will fix the issue. But could the machine running hot have damaged to CPU or motherboard? I thought there were failsafes so the cpu will shut down before it critically overheats.

Also forgot to mention I bought new video card a month ago but have had no issues with it. Installed it and it worked fine. No PSU issues or anything.

I am very new to building computers so and advice on where to begin troubleshooting this is SOOO appreciated. Thank you all for your time