Raptrozz

Probably BIOS incompatible versions? Try flashing the BIOS after searching which version supported the i7-2600. Also clear CMOS battery. 
Can you at least boot in the BIOS?

Well, that CPU for $37 would be better than an i7 2600k for $75. Unless you really want to overclock the heck out of it.
 
You could see, if the other xeons are a better deal. The dokument, that I linked, shows you all the supported CPUs

True, but with the ryzen i have to invest in a Mobo and ram as well so..

That is waayy too much for a 2600k. You should at maximum pay $40 for it.
 
For that price you could almost get a ryzen 5 1600

Not if you keep the same drive.
 
Well thats a reason

Same socket so yeah

Yes it should.
 
Here is the dokument from intel https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/desktop-boards/DB75EN.pdf

yes the cpu upgrade and the gpu upgrade will give you massive fps boost is CSGO. try to find used i7 3770k's. for the gpu rx 570/580 used is the best bet.
 
what psu and motherboard do you have?

well rx 580 or rx 570 are better bang for the buck. they are pretty much gtx 1060 6gb but with 8gb if vram

GTX 1060