Shutdown after posting

Hello. I have pc with specs: rx 480 8GB, atx-800w PSU, z170 motherboard, 8GB ram 2133mhz, i7 7700 cpu. When I am turning it on, it is posting bios, I can even enter bios and after posting bios screen it just turns off. I have not seen even a single post about this problem, am I the one who has...

PC shutdowns 2-3 seconds after I press power button. Usually after 3-7 times it boots with "BIOS checksum error" and automatic recovery. On lucky day it boots from first time. I replaced CMOS battery (small round in motherboard) but it didn't help. How to fix this issue? I have 11 year old...

Hey guys! Recently I bought some new PC parts and I combined those with some I already had. My old specs: i7 930 MSI X58 Pro-E Nvidia GTX 970 Kingston HyperX DDR3 24GB (triple channel 3x8GB) Corsair RM750x (White) My new specs: Ryzen 7 3700X 16GB GSkill TridentZ Neo CL16 3600MHz X570 Gigabyte...

Because our computer would not turn on(somtimes it turns on) we went to a computer repair to get it fixed. He replaced the motherboard and the proccessor. Now our PC would start but when starting a game it automatically shuts down by itself even those low old games. I can do many things except...