HT3988 imac power button pulses but imac will not turn on

imac power button will turn on

Hi and Welcome,
On my old G5 when I saw the red light through the front grill it meant that the machine was not going to boot. I just turned it off in the front, a hard shutdown, when I saw it. For me, I was able to wait for for a while and usually it would start up with no trouble again. But that Mac also had heat issues and sometimes running a small fan through the grill would allow me to start up sooner.
One thing that might be adding to your problem might be the amount of RAM you have, it's a very small amount.
Is your Hard Drive almost full? That can be a problem.
Can you start from one of the OS disks and use the app Disk Utility?
If you have the Discs that came with the Mac (originally), on one should be The Apple Hardware Test. That might help you diagnose the issue.
A PMU reset might get you started again. It's a bit model specific, for some it's just pulling the cord out (sound familiar?) and that resets the NVRAM. For other models this is a good reference: http://support.apple.com/kb/HT1436
Quicktime likes RAM, so does your Mac in general, the amount you have is just sliding by.
Take a look inside your Mac to see if it's very dusty inside. That can cause a host of problems.
Good luck.

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HT3988 imac power button pulses but imac will not turn on

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