I have a gaming PC that I bought prebuilt online. The only thing that I changed was the GPU. I put my GTX 970 from a previous build in it and gave a friend the 1050ti that came with it. Didn’t really think about it but it took about a year for that to burn out the 500w PSU that came with the rig. I replaced it with a brand new Corsair 750w and everything ran beautifully for about two minutes and then the system completely froze. I’ve tried everything I can think of, double and triple checked all of my connections, reseated everything, even formatted my harddrive and reinstalled win10 from a disc. All to no avail. I keep getting complete system lockups at random and can’t seem to figure it out for the life of me. Any help would be greatly appreciated!