iMac 27" 2009 - Display not working, not even a flicker
I recently purchased an iMac 27", 2009 i5 model. It worked fine for a bit, but now the display will, seemingly, not power on. Or at least nothing appears on the screen.
When I turn it on, I hear the startup chime. After that, nothing. Just a black screen. I connected it to an external display, but I still do not receive so much as a flicker.
Another thing I found a bit odd, after turning it on and hearing the startup chime, if I press the power button, the system immediately shuts off. I know typically you have to hold the button for 10~ seconds before the machine will turn off. But it turns off immediately after pushing it.
Any ideas? I've tried the obvious NVRAM/PRAM reset, SMC reset, and attempted booting into recovery, all to no avail. Not even with an external display. I've also tried Option-booting to a Yosemite USB, but, as I cannot see anything on the display, I cannot tell of it boots up to the selection screen or not.
Is this a good question?