Just recieved broken iMac. Only led 1 and 2 on.
I just bought a used imac 21.5 emc 2389
Was told power supply was replaced but its still not working. (Have reciept and old power supply so i know it was replaced)
So with some help from google i checked the led diagnostic lights and light 1 and 2 light up but 3 and 4 do not.
I get no chimes, no beeps, screen does not light up or do anything.
This did not come with a keyboard or mouse so i will have to buy them IF i can get it to boot up.
From my googling ive found that led light 3 not lighting up means that the logic board isnt recieving signal from the graphics card?
Is there ANY other things to check befoe ruling its the graphic card or logic board?
Would like to get this working as cheap as possible.
Thanks in advanced
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Just took it all the way back down to the logic board again. Pulled gpu, Reseated it. Checked power supply cable pins-Checked out good.
Made quadruple positive all the wires are hooked up and hooked up correctly.
Put it all back together and same thing-power cord plugged in 1st led diagnostic light on.
Hit power switch, Fans and hdd turn on, 1st led remains on. 2,3,4 are off.
After a few seconds fans increase to full speed, with only the 1st led on.
Nothing changes after that.
Ive unplugged and rebooted a few times with the same results every time.
I even switched out the brand new power supply in it for the old one and got the same results (Looks like the old one was still good (got proper 12v and 5v readings from it)
I am at a loss as to what happened.
Did I kill the gpu chip which fried logic board?
Did I mishandle something?
Missing some small hidden cable?
I did something wrong but have no idea what.
by Nitro
Any suggestions?
by Nitro