One of my friends gave me a 27'' 2009 imac that they didn't want anymore and it came without a hard drive. I tested it with a windows 10 hard drive and it actually works pretty well, so I was wondering if I can install mac os on it. I know it won't support big sur or catalina but maybe high sierra? It has an i5 750, 8gb ram, and a radeon hd 4850
If I can, how? I don't have much experience with macs