Hello i just built my friend a gaming computer, when I start it up it turns on for 21 seconds then turns of and on again. All of the parts work.
WD Blue 1TB Desktop Hard Disk Drive - SATA 6 Gb/s
Intel Pentium G Series 3.50 GHz Dual-Core LGA 1151 Processor
Apevia ATX-CT520W Captain 520W Power...