PC turns on but sometimes it turns off before operating system starts

[B0884]

Help! 

So my computer turns on and I get the boot led red then yellow, then green. Screen come on and I get post and I can get into bios no problem. And then load windows no issue.. play for hours no temp issue. CPS never gets higher than 64. Stable over clocked I9 9900K at 5.1 GHZ and OC is done automatically by Motherboard system. Water AIO cooling on CPU Everything has been fine for 3 months. Now sometimes not always the PC starts, post, then goes to the next screen before Windows 10 get to start and just turn off. No error beeps. If i try to turn it on again then goes through boots straight to windows (windows doesn't report an failed boot) and runs normally. Its happen about 5 time now and I am worried about what can it be. All components in PC are brand new all bought in the beginning of February. I linked my parts list below for reference. 

 

 

PCPartPicker part list / Price breakdown by merchant

Type	Item	Price
CPU	Intel - Core i9-9900K 3.6 GHz 8-Core Processor	$479.99 @ Walmart
CPU Cooler	Corsair - H100i PRO 75 CFM Liquid CPU Cooler	$99.89 @ OutletPC
Motherboard	Asus - PRIME Z390-A ATX LGA1151 Motherboard	$182.49 @ SuperBiiz
Memory	G.Skill - Trident Z RGB 16 GB (2 x 8 GB) DDR4-3200 Memory	$120.98 @ Newegg
Storage	Western Digital - Blue 500 GB 2.5" Solid State Drive	$64.89 @ OutletPC
Storage	Seagate - Barracuda LP 1.5 TB 3.5" 5900RPM Internal Hard Drive	$233.50 @ Amazon
Video Card	Gigabyte - GeForce GTX 1660 Ti 6 GB OC Video Card	$279.99 @ Amazon
Case	Phanteks - Eclipse P300 Tempered Glass (Black) ATX Mid Tower Case	$55.98 @ Newegg
Power Supply	SeaSonic - FOCUS Plus Gold 750 W 80+ Gold Certified Fully-Modular ATX Power Supply	$97.88 @ OutletPC
Operating System	Microsoft - Windows 10 Pro OEM 64-bit	$139.89 @ OutletPC
	Prices include shipping, taxes, rebates, and discounts
	Total (before mail-in rebates)	$1830.48
	Mail-in rebates	-$75.00
	Total	$1755.48
	Generated by PCPartPicker 2019-04-23 20:06 EDT-0400

 

 

[TrigrH]

firstly update the bios, to me it sounds like the board is struggling to post the memory timings.

[B0884]

Looks like you are correct.  So far so good. Update bios to current and haven't seen a failure yet! Also it looks like I may have gotten lucky in the silicone lottery I am now stable at 5.2 GHZ  on Auto Overclocking! Thank you so much!