Bios definitely outdated. BUT here's the good news. I solved the problem. When I assembled the machine long after pumpkin time, I was so tired and fed up, that I forgot to put back the battery, and switched it on running on mains. Booted immediately. I thought it was just a fluke, so I restarted and even did a shutdown, leaving it for 10 minutes. No looping anymore. So instead of spending a packet on a new motherboard and still looping, my friend needs to invest in a new battery. Happy Friday to everyone, and thank you for trying to help. GB.