Hello, my 2012 server i7 2.3 dual 1TB mac mini has been acting up. First one of the drives failed according to it. But outside of the machine both drives seems fine. After replacing the drives it didn't turn on properly and not just leaves me with a repeating boot chime. Different drives or ram does not make any difference. Resetting SMC does nothing. Resetting PRAM seems not even possible because the keyboard isn't lighting up at all. I also noticed that an external hard drive would spin up but its light would not turn on, which it does on any other computer. I wonder if the issue might be PSU-related, like it isn't giving enough power on 12/5V or something like that. I have disassembled it entirely again and looked closely at the boards and I can not see any damage or whatsoever that might have caused any error. It's a cute and great machine so it would be nice to have it up and running again but for now I guess it might not happen. If anyone has any advice I'm happy to try it. But, since it can not boot past the boot chime - I can not reinstall an operating system, boot from USB or any other kind of device. It simply seems stuck there. To be noted too: it also boots automatically without a push of the power button. I have removed the battery for over 30 minutes without any different behaviour as well. Thanks!