I have a powermac 7500/100 and when i was trying to use toast deluxe 4 to run some 'toast files' the computer was stuck many times. I was using the power button to turn the computer off but nothing was happening and the only way to turn it off was to pull out the plug from the socket. Unfortunately the powermac doesn't work now. It doesn't turn on. What is the problem? The power supply was burned?

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Since you're leaving out many details, then this is only based on the little bit of information you've given. Yes, it's entirely possible that the power supply is dead. What usually happens, though, is that the heat sink grease between the PowerPC 601 and the heat sink dries up and the processor gets cooled unevenly, and this leads to crashing and lockups (particularly when running the CPU at 100% like when you're running Toast).

When you say the machine doesn't turn on, do you mean that when you push the power button absolutely NOTHING happens?