Tried installing only Windows, cub linux, android, and ubuntu. My computer won't boot from any other os except for mac os....

TRY LEAVING IT PLUGGED IN AND KEEP PRESSING BUTTON UNTIL TURNS ON (usually 3 times)-------------IF WON'T TURN OFF HOLD BUTTON OR UNPLUG THE PLUG BACK IN QUICK (KEEP TRYING) I have 2 iMac G3s> one iMac indigo summer of 2000 and one iMac G3 tangerine 1998-1999. My tangerine iMac has a bad flyback transformer it pops every 5-10 minutes. When it pops a black horizontal line appears on the screen. I have hears the sound is an arch between the contacts. I have no idea how much it costs to fix this. My indigo iMac has a few bulging caps and when i push the power button the white light comes on then shuts off> it makes a high pitch noise. After pressing the power button it turn on successfully. If you unplug it then you will have to go through this process again. LEAVE THE iMACS PLUGGED IN IF YOU CAN!

IF ITs NOT THE RAM READ THIS I have 2 iMac G3s> one iMac indigo summer of 2000 and one iMac G3 tangerine 1998-1999. My tangerine iMac has a bad flyback transformer it pops every 5-10 minutes. When it pops a black horizontal line appears on the screen. I have hears the sound is an arch between the contacts. I have no idea how much it costs to fix this. My indigo iMac has a few bulging caps and when i push the power button the white light comes on then shuts off> it makes a high pitch noise. After pressing the power button it turn on successfully. If you unplug it then you will have to go through this process again. LEAVE THE iMACS PLUGGED IN IF YOU CAN!