iMac bootup sequence stops.
As I try to boot the computer, it plays the boot-up sound for a literal second then immediately shuts down.
I got the machine like this.
Edit: some changes
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Sadly, this sounds .like the GPU board has failed Sostituzione scheda grafica iMac Intel 27" (fine 2009 o metà 2010)
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Take the cable (AC) out of the unit and depress the power button for 10 seconds. Plug the AC back in an try to reboot. If it exhibits the same no boot or works for a short time, then shuts off, probably is the power supply board. Just guessing :)
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It shows the same results. A second of tune then shuts off
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So you see any image at all?
Do you see the Apple Logo and then the progress bar about how long is the bar (mm)
If you don't see any image let the system sit for a good five minutes. Then take a flashlight placed on the screen at a sharp angle do you see a faint image of your desktop and its icons?
da Dan
No logo just flashes a white screen and stops the boot-up
da PJ Tayag