HT4840 Boot camp does not boot to Windows 7 disk after completing disk partition - white blank screen

After completing the partitionning of the hard disk, the iMac reboots but nothing happens. The system does not boot from the Windows 7 disk.
A blank screen appears and that's all.
I have tried to manually boot from the disk by pressing the <Alt> kei will restarting the iMac. The system display the option of booting from the iMac hard disk or the Windows 7 disk. Seelcting the Windows 7 option does noting.
Thanks in helping me find a solution to my boot problem.
Danarc54

Are using a 64 bit version or a 32 bit version of Windows?
I'm not up on the iMacs but according to this article you may not be able to use 64bit Windows.

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