Apple PowerMac Power Macintosh G4 Mac M8493 with 120Gbytes hard Used For Graphic Design (Read)

Note : this is one of my Macs that l used to have for my graphic design along time ago , computer powers on and hear the vent touching the frame vent cover probably it’s loos and the screen showing these wired symbols , l have no clue what happened since l didn’t use since 2012 l have no clue if it’s going to be a quick repair or just a big part, it’s sold as is as wishing luck to the new owner. We have sold some of our company’s computers as parts but some of them turned out to be working fine after troubleshooting, see photos for the screen symbols and condition, also computers are dusty due time storage which needs a good vacuum or clean .

Issue might be : hard drive is dead or there is just no OS