Blank White Screen Shows No Sign of Startup

Bought this model from a PC World as ex-display. Issues started a few weeks back when the machine decided to take absolutely ages before decided to say the hard drive could no longer be detected.

Used Disk Utility to try and sort the hard drive but found it wouldn’t show at all that a Hard Drive was installed. At first, I thought this was simply a case of a dead hard drive so, I decided to change the hard drive and found that it seemed to be more than just hardware replacement. It seemed as if no power was going to the hard drive for it to be detected by OS X.

Purchased a new power cable to replace the one inside (checked out various forums online that seemed to support that this was the issue). Once the cable was replaced, the video decided to be the issue instead.

Since replacing the cable for the iMac, it’s decided to stop working altogether (simply brings up a blank white screen, but the start up chime works).

Suspect that there’s either something wrong with the cable that’s been put in or the Logic Board / Video Card have decided to pack in (I connected an external display to see if the video would show up on this, but will not show any video output).

Other than that, all other internal components seem to work fine, hard drive has been connected to another machine and shows as working perfect.

All 4 LEDs lights show up fine, but I'me getting fed up of going in and out of the machine all the time to try and figure out the issue. Would really appreciate any help on this before I put it on eBay as spares or repair.

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Are you sure this is all correct? It appears you have a power supply problem but yet the logic boards diagnostic LED's are telling us the logic board is getting power and the internal display is communicating with the logic board. Then you tried the external display only to tell us it is not functioning which implies the video card is bad but the LED are telling us its OK. You are also telling us the HD is not being seen which points to either a bad drive or the power supply is having problems.

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Hi Dan,

Yes the above is correct. The only thing I've not done is put the original power cable back into the machine to see if video comes back up (with the old cable, I could boot into internet recovery and see everything, but again disk util couldn't see the hard drive - thats why I thought it was a power issue - no power to hard drive for it to be detected).

Ian

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Please double check things as this just doesn't add up. You have a Möbius loop of a problem here. Each symptom and cross-check proves a different problem which then circles back.

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