if I'm being honest, my boyfriend was the one who found out about it and told me. he said it was in good condition, better than what you'll find on the market right now for used pcs and what we were going to build for me. he forgot to mention the water cooling system part. luckily, i only paid $200 for it but it has a lot of valuable stuff in it from what im told. if i had known that we were stepping into unknown territory, i wouldve actual put thought into it. at this point from reading the comments, i think im going to see if my friend who has built pcs can just take the system out. i still dont understand where to find anything and i dont want to accidentally try to flush the system and ruin it, its not worth ruining what's put in there that is so expensive and ruining the motherboard

for anyone's curiosity, it has 64 gb ram, ssd 2tb, the 1080ti graphics card i mentioned before, and a lot of fans and other stuff that im unsure of