Replced hard drive, now just get a black screen on startup? help please!

Hi all
So today I upgraded my hard drive in my 17" white iMac, i was pretty careful and ive double checked that all wires/connections were reattached but when i start it up i hear the start up tone but the screen just stays blank, tried the PRAM reset and even hooked up an external display and getting nothing at all. I put my installation disk in and can hear the disk being read etc but just getting a blank screen.
Any advice much appreciated
Thanks
Wayne

Sounds like you didn't reconnect the backlight inverter cable when you reassembled:
http://www.ifixit.com/Guide/Repair/Installing-iMac-Intel-17-Inch-Hard-Drive-Repl acement/891/4
If you shine a bright light/sunlight on the screen, can you see faint activity? If not, then it would be the data cable you didn't connect:
http://www.ifixit.com/Guide/Repair/Installing-iMac-Intel-17-Inch-Hard-Drive-Repl acement/891/3

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