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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Changed HD in iMac; now monitor does not come on


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Rubadub

 
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I recently opened my iMac (circa 2008) and replaced the hard drive. Closed everything back up, turned it on, everything seemed to power up, but monitor did not come on. Opened everything again, replaced the old HD and left the case open while powering up. Everything works, but no image on the monitor. Ideas?
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Raz0rEdge

 
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You didn't say if you have the 20" or 24" iMac's..

Check out these iFixit instructions for them and see if you skipped or missed any step.
iMac Intel 20" EMC 2133 and 2210 Hard Drive Replacement - iFixit
Installing iMac Intel 24" EMC 2134 and 2211 Hard Drive - iFixit

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Rubadub

 
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Sorry, iMac 24-inch
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chscag

 
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Take notice that in the steps given at ifixit, there are several cables and connectors that have to be removed that are related to video and the LCD. I would go back and check to see that they were correctly reinstalled and especially not damaged in the process.

It's possible a connector was damaged or a cable not pushed back in to its socket connector far enough to make good contact. Also, ribbon cables are easily damaged if they're twisted or bent too far.
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Rubadub

 
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I checked all the connections, and they seem good. When you change hard drives in the iMac, are there any 'key strokes' or 'key combinations' that need to be done when starting it anew? This is very frustrating.
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No. The only possibility that I can think of which would prevent the screen from coming on I've already mentioned in my previous post. It's possible that either a connector was damaged or a video cable. Sometimes it almost impossible to spot that kind of damage. And may not have been your fault. As a machine ages inside due to heat build up, cables get brittle and connectors begin to separate.

Remove the front display panel again but try to keep all wires and cables intact if possible. Make sure nothing hot gets grounded and turn the machine on. Then gently wiggle the cables and connectors from the display to the logic board. You may be able to find out that way.
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Rubadub

 
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OK, thanks for the info. I will check everything again. Just noticed you were from FW. I'm in Cedar Hill.
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