Friend's PC stuck in boot loop and no signal

[BigRecoiilz]

My friend has been struggling to solve his PC problem for a couple months now. I was finally able to take a look at it at home and I'm having the same problem; boot loop and no monitor signal. I reapplied thermal paste and changed his CPU cooler to a stock Intel one that I had laying around since the one he had on wasn't too secure. Also, I noticed that his motherboard only has one 4 pin EPS (CPU) header instead of the traditional/usual 4+4 pin slot. As far as I know, that shouldn't really a be a problem to cause a boot loop, maybe just won't get the most out of his PC due to power constraints. His specs are as follows;

 

CPU: i7 9700KF

Mobo: Not sure which motherboard exactly he has but it's definitely a Gigabyte Ultra Durable Mini ATX model (LGA1151 of course)

GPU: Gigabyte 1660 Ti

RAM: T-Create 16GB (unsure of clock speed)

PSU: Aresgame AGW650 80+ Bronze

Storage: WD Green SN350 1TB