Help! My iMac is turning on but then shutting itself off before it boots!

J

JellyFish

macrumors regular

Original poster

• Jul 12, 2008

• #1

Something is wrong with my aluminum imac. I turn it on, I see the Apple logo and then...it shuts off. It won't finish booting.

I tried starting with the Shift key but it does the same thing.

Can somebody help??? 😕

 

gehrbox

macrumors 65816

• Jul 12, 2008

• #2

JellyFish said:

Something is wrong with my aluminum imac. I turn it on, I see the Apple logo and then...it shuts off. It won't finish booting.

I tried starting with the Shift key but it does the same thing.

Can somebody help??? 😕

Click to expand...

Zap the PRAM as follows:
http://support.apple.com/kb/HT1379?viewlocale=en_US

Then perform an SMC reset as follows:
http://support.apple.com/kb/HT1543?viewlocale=en_US

 

G

greentree_uk

macrumors newbie

• Jul 13, 2008

• #3

sounds like a hardware problem. you'll need to visit an apple service centre

 

CWallace

macrumors G5

• Jul 13, 2008

• #4

Do your fans spin really fast when it starts? Intel CPUs will power themselves off if they overheat to prevent damage.

If the PRAM and SMC resets do not fix the problem, take it in for a service review.