[SOLVED] Repair shop said there was no problem, computer won't boot up now

[BusyJack]

My Specs are: ryzen 1700, gtx 970, rm750i PSU, asus motherboard and corsair ram (information is kept on my pc go figure).

About a week and a half ago my pc just stopped Booting/Posting all together, not even a split-second bootup like other times there's been issues. After a week I took it to the shop, where as of yesterday when picking it up, I was given a funny look and told that the pc is in fine working order, and I was able to use it most of the day and into the night. Fast forward to this morning however, and the same issue has reappeared, only this time I feel like I've run out of options by taking it to "professionals" to get it sorted

 

[Eximo]

Take the entire system apart, go back to basics and assemble it outside of the case. Add one component at a time. See if it persists. (Minimum in your case is motherboard, CPU, power supply, a single stick of memory and the GPU to get a picture, you can confirm it works without the GPU by looking/listening to boot codes)

Might have a loose or pinched wire somewhere. Bad connection. Transporting it may have temporarily fixed it.

Since your PSU is modular, swap cables where possible. Had a shorted SATA connector stump me for a few hours on a friends build, we just had to toss that power cable, everything worked after that.

Check your peripherals, shorted mice and keyboards with pinched wires can cause no-POST due to shorted 5V wires. Check your USB ports for physical damage.

Beyond that, check your local power situation. If you have a voltmeter, measure your wall outlets, and power coming out of any surge suppressors, or anything else you might have plugged in. At a minimum, change outlets, maybe power cables as well. Obviously it worked in their environment, so could be your place. Bad breaker, ground loops.