PC Froze then Died

Oct 16, 2018
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It randomly froze,i restarted,it froze again and after doing the process 2-3 times it died.

It starts up,no video output(Screen goes Power Saving),everything spins normally(Fans,GPU,CPU,HDD)
It's been disconnecting the keyboard randomly(I blamed it as faulty hardware) but it then started disconnecting the mouse before it died.
I pulled everything apart and cleaned it,placed one stick of ram at a time,at different slots,tried on board graphics,nothing works.
(Doesnt even get to bios)
I really don't know what's wrong,the GPU had been artifacting 2 years ago,but works fine now.

The ram i had purchased was causing blue screens.

In general,Murphy's rule really applies to me.
 
Solution
could you get another cpu to just test with, like a spare or something from a friend perhaps? i mean just to breadboard it, cpu, one rams stick and your new mobo.... see if it posts. then add the video card, see if it's the problem
Oct 16, 2018
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I5-8600k (not OC)
Asrock Z370M ITX/ac
R9 280x Sapphire Toxic (4 years old)
Stp-650w PSU (4 years old)
Coolermaster 130(case)
2x8GB Ballistix Ram
500gb Western Digital Drive
240GB Samsung Evo 970 M.2 NVME

 
Oct 16, 2018
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System wattage is about 430w.
It had been running with an FX-6300 prior to the i5.

My main concern is why it had the keyboard/mouse disconnecting.
(of course i'll be getting a new PSU to check stuff out then,i was mainly focused on the Mobo being bad)
 
Oct 16, 2018
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Sadly i cant stress test it because it wont turn on..I'll buy a new one and give info to resolve this for others with the same problem.
 
Oct 16, 2018
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Thank you for sticking with me,I sent the CPU back for warranty and will be replaced,i figured it's that since it wont post with new mobo,new psu and one stick of ram at a time.Since it has a built in Graphics chip it should had video output anyway.