Question 7 year old PC - i7 - stuck in boot loop

[Wolff87]

Hi,

I have a system with the following specs -

Intel i7 - 6700k
Gigabyte GA-Z170-D3H Mobo
16 GB Corsair Vengeance LPX DDR4 x 2
Zotac GTX970 Graphics
Adata M.2 250gb
Cooler Master 600W PSU

I have been using this system for the past 7 years. Sometimes, the system would randomly reboot with no BSOD and I ignored it as it was quite rare.

Recently, it started rebooting randomly and would be stuck in a boot loop. Boot screen would show up and it would automatically restart. I would shut the power out for a few minutes and then it would start normally. When it's on, it runs pretty well. Until, suddenly, it would restart.
Now it is currently stuck in a boot loop. It automatically turns on and reboots every 5 to 8 seconds.

I have tried the following fixes -
1. Put new cmos battery. Reset cmos values.
2. Put a new PSU to check and it still does the same.
3. Removed everything except PSU, MOBO and CPU and it still switches on and now reboots every 2 seconds.

Please advise what to do! System was running fine (except for rare reboots) till recently. No changes were done. and now its stuck in a boot loop.

 

[helpstar]

gpu still the same?
without angpu the pc won't work. your cpu doesn't provide an internal GPU, the motherboard's ports are disabled.
remove the ssd and other drives and check if you can get into the Bios