Start with the machine turned off. Disk removed.
Turn machine on and wait about 10 seconds.
Hold down 3 keys simultaneously (ALT+UP ARROW + DOWN ARROW) on the machine.
Listen for beep. Then release the 3 keys. If no beep it’s ok.
See what the display reads. It should say EMT10T B0
If it doesn’t say EMT10T B0 then hit the up or down arrow until you see EMT10T B0 and then hit enter.
Hit enter again. It should then go through some tests and say Insert Boot Disk.
Insert the disk and hit Enter. It should then boot up.
If the machine is networked to a computer it will say Download Requested and power up.