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i made an account just to say thank you 

Disclaimer: This guide is only for systems that use the LGA1155 socket. HP 6000 systems and other LGA775 systems are not compatible.
 
Hi, first I apologize for any grammar mistakes, English is not my native language, so i wanted to upgrade my HP pro 6300's power supply to something more powerful but the motherboard gets power from a weird p2 connector and a 6 pin connector instead of a standard 24 pin power connector. after doing a little bit of research, i managed to stick in an EVGA 500w PSU and everything is working fine so far, if anyone wants to know how i did it, here is what you need to do.
 
- buy a 24 pin to 6 pin adapter cable ( around $10) https://i.imgur.com/mAH1oTQ.jpg but they are made for z220/z230 workstations only. so, you'll have to easily change the pins layout of that white p2 connector for the adapter to work with your HP pro 6300. (this is the one I bought   https://www.amazon.ca/gp/product/B075242NGZ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1)
 
- remove all 4 cables from that white p2 connector and compare the cables with the ones from your old PSU.
your old PSU will have 4 or 5 cables on that p2 connector ( grey, green, white, white with red stripes, and sometimes black) .
the adapter will have (yellow, green, red, black)
 
ok, then put the yellow cable back in where the grey one was and put the green one back in where the green one was and put the black one back in where the pure white one was. and put the red one exactly next to where you put the yellow one. 
 
ok now turn on your pc and that's it.
 
if you get an error on startup saying that the PSU fan is not detected, press F1 to ignore it and continue, but if you get tired of the error every time you start your pc and want to fix it, here is what to do.
 
remember the black cable you inserted where the pure white one was, that cable is a TAC cable, it sends the PSU fan speed readings to motherboard but since the new PSU's wiring is not the same as the old HP one, the motherboard has no clue. so, you'll need to cut that black cable from where the cable meets with the 24 pin connector thingy (just to get enough length of it) https://i.imgur.com/n3W9MG5.jpg and then you'll need to attach it to the green TAC cable of the CPU fan connector and this will trick the motherboard into thinking that the CPU fan it is sensing is the PSU fan and you won't get any errors. Good luck
https://i.imgur.com/63KGBe5.jpg
https://i.imgur.com/DRN6twk.jpg
Edit : The fan error stopped showing up after a few days or so without doing any modification (that fan error is probably set up to show up a certain number of times). 
 
Edit 2: Another option would be buying a dual SATA to 6 pin or 8 pin cable but it's not really recommended for anything above a GTX1060 cause these prebuilt PCs come with only 320W PSU, here's how it works https://www.youtube.com/watch?v=JkmsLxnCfrQ
 
Edit 3:  Here's a diagram of how exactly my adapter is wired https://imgur.com/20grXCC. For those that have differently colored adapters, you can still follow this diagram but you gotta check where your wires are going exactly.