[SOLVED] motherboard wont boot

[wurlah]

I just got a used motherboard today and when I tried to turn on the pc the motherboard turns on for a second then turns off. When I click the power button again it does it again then I smell smoke. I'm not sure what the issue is, I tried different ram slots, gpus, and ram but the same results.

Pc parts
i7-875k
ASUS P7P55D-E Pro
Patriot 4gb ddr3 1x4gb
intel stock cooler
r5 340x
antec vp-450w psu

 

[Ralston18]

What was the reason for getting the used motherboard?

Where did you get the motherboard? Source/seller?

One immediate starting point is to reapply the CPU thermal paste.

How old is that antec PSU? Previous heavy use for gaming, video editing, or even bit-mining?

 

[wurlah]

What was the reason for getting the used motherboard?

Where did you get the motherboard? Source/seller?

One immediate starting point is to reapply the CPU thermal paste.

How old is that antec PSU? Previous heavy use for gaming, video editing, or even bit-mining?

I found it on a app called offerup for a great price.
I did reapply the thermal paste and replaced the cpu fan.
The antec psu was used in my old pc, I mostly played games like gta v and valorant.

 

[Ralston18]

Try to determine the source of smoke smell.

Do so carefully because the fumes may be toxic.

Check motherboard, PSU, and other components.

Might have been just a bit of dust or packing material that got hot and burned.

However, the power button behavior makes me think that the PSU could be the source of the problem - especially if past history includes heavy gaming use.

Are you able to obtain a known working PSU to swap in for testing purposes?