Hello, I am new to the UNIX community, however I have a beginner's level understanding of a majority of the basic commands in UNIX.
Today, my teacher gave me her old AT&T UNIX PC. I brought it home, turned it on, and got a completely green screen. I turned it off, and back on and it booted fine. At the login, I typed root and for the password, she had it as eos I believe. (I changed it.) Anyway, I then proceeded to type 'finger' and it displayed the result of only root and powered down. Since then, flipping the switch, I have not been able to turn it back on.
Most systems either display something on the screen, or give BIOS beeps to indicate the error condition. The pattern of short and long beeps is the "error code." These are standard by vendor, and can easily be googled.
So does anything happen when you flip the switch? Do you hear a fan? Have you looked under the cover to see if there are any indicator lights ON at the motherboard, or elsewhere?
Is the fuse in the PC, or in the building? If it's in the PC, then the power supply for the PC may be bad. If it's for the building, it could just be an overloaded electrical circuit.
Capacitors may have dried out and failed in electronics that old. I once had an IBM PC-XT spit flaming bits off the board from a spectacular power supply failure after a decade or so sitting around mothballed...
Could be capacitors. Fuse in the PC. Tried other power supplies. Blew three fuses. I want to fix it though. No matter how much it costs. I know how to solder too.