PC wont turn on but it has power

[Nikola_011]

hey guys , im having big big problem. My pc turns on after maybe 7-15 restarts (truning on by holding power button for some period of time and then turning on again). When i start it it gets power to coolers but im not getting the picture..i tryed literally everything.. clearing cmos, reasembling all computer parts, removnig ram separatelly... summarry: i can turn on my pc, but after 7-15th time and that must be some problem... some say the problem is in PSU and some say that if the problem is in the psu then i couldnt turn it on at all... i just hope the problem isnt in motherboard... any ideas?

asus a58m-k
2x4gb ram ddr3 kingston
amd radeon r7 200 series
amd athlon x4 840
psu 600w

 

[R_1]

can you access/borrow a PSU from someone? swap units and each will test the other.