PC keeps rebooting

[Barely_1]

I recently bought an used cpu and motherboard - i5-4590 and Gigabyte GA-B85M-D3H. And when i put the entire pc together it would reboot right after the windows logo, unable to boot into safemode by tapping f8. I have tried resetting the cmos, but didn't help. Rest of my pc specs: 1TB WD HDD 5400RPM
PSU:400w beQuiet!
GPU: R9 270 2gb GDDR5
Also, it worked before i made the upgrade and i had AMD Phenom X4 970 AND Asrock 960GM-VGS3 FX
So the following cannot be at fault:
HDD: Cause it worked before the upgrade and on a diffrent laptop.
PSU: Worked before and the cpu that i was upgrading from is 125w but the current one is about 85w
GPU: Worked before.
Also, i randomly also got bluescreens and then a restart , not only a restart after logo, one of the messages was: THREAD_EXCEPTION_NOT_HANDLED, or something likr that

 

[Calvin7]

R9 270 2gb GDDR5
Minimum Power Requirements:
500 Watt Power Supply (Suggestion)
1 x 6-pin AUX Power Connector

cpu that i was 125w but the current one is about 85w

The Thermal Design Power (TDP) is the average maximum power a processor can dissipate while running commercially available software. TDP is primarily used as a guideline for manufacturers of thermal solutions (heatsinks/fans, etc) which tells them how much heat their solution should dissipate. TDP wattage is not a measure of the maximum power the CPU may use.

 

[Barely_1]

Just tried to install Windows 7 and got PFN_LIST_CORRUPT right after Windows is preparing files

 

[Barely_1]

@calvin7, the pc ran fine before, with an overclock on both gpu and cpu (which was more power hungry), it is not the PSU's fault,.i am aware of the minimum requirements

 

[Barely_1]

got another BSOD when attempting win7 installation: BAD_POOL_HEADER