IMac won't wake up

[Wappie123]

So I put my iMac to sleep, and it seems like it's permanently.

I hear it start and shut down when I press the power button, but that's it.

The screen stays black / off. The keyboard won't connect (not with, not without cable). At least that's what I assume since the caps light won't go on/off when I press it.

Same goes for the mouse. No signal at all (red light at the bottom stays off).

Please help me!!

 

[wilberforce]

Try holding the power button for 10 seconds, to force a shut down

 

[DeltaMac]

What model iMac do you have?

What sound do you hear when booting, and does it simply shut back off within a few seconds?
Press and hold the power button for 10 seconds (or just unplug the power cord for a bit, then plug back in)
Press and release the power button. Hold Option-Command-P-R. If your iMac is more than 3 or 4 years old, you should get a boot chime sound. Keep holding the same 4 keys until you hear the chime 2 more times, then release the keys to allow a normal boot.
If it doesn't do anything different, and just shuts back off, then you might have a failed power supply.

 

[Wappie123]

Try holding the power button for 10 seconds, to force a shut down

Done several times.

 

[Wappie123]

What model iMac do you have?

What sound do you hear when booting, and does it simply shut back off within a few seconds?
Press and hold the power button for 10 seconds (or just unplug the power cord for a bit, then plug back in)
Press and release the power button. Hold Option-Command-P-R. If your iMac is more than 3 or 4 years old, you should get a boot chime sound. Keep holding the same 4 keys until you hear the chime 2 more times, then release the keys to allow a normal boot.
If it doesn't do anything different, and just shuts back off, then you might have a failed power supply.

No I shut it on off myself. It stays on if I don't turn it off.

I tried the command option p r one, but as I said, I don't have the feeling the keyboard is actually connecting.

I have an iMac of about 2 years old.

The sound is that standard sound it always makes when it starts up. With the copr combo I do not hear anything different.

 

[wilberforce]

Is it a 27" iMac (with removable RAM)? If so try removing all the RAM, which should force a POST error on startup. Then power off and replace the RAM and start again.

 

[Wappie123]

Is it a 27" iMac (with removable RAM)? If so try removing all the RAM, which should force a POST error on startup. Then power off and replace the RAM and start again.

No, unfortunately I do not have removable ram. I just compared with the ones who do and my underside of the screen is a lot thinner and has no screws.

 

[Wappie123]

Is it a 27" iMac (with removable RAM)? If so try removing all the RAM, which should force a POST error on startup. Then power off and replace the RAM and start again.

No, unfortunately not. I just compared it with the ones that do, and my underside of the screen is a lot thinner.

 

[DeltaMac]

The 27-inch is, well, 27 inch screen. There's a door on the back, above the power cord. The RAM sticks can be removed easily.
But the 21.5-inch, yes, you have to cut through the tape that holds the enclosure together, then remove the logic board. Not a task for the timid...