After the installation of win7 with bootcamp Lion stops booting at apple logo. Any help to fix this ?

I installed Windows 7 with Bootcamp on a new iMac 21inch with Lion. Everything went well. While running win7 I installed some software like Daemon Tools and Fear 3. It runs perfectly. When I reboot into Lion (throught Bootcamp) the computer stops at the Apple logo. It stays there for hours. I checked and restored the Macintosh HD but it keeps hanging. After restoring a backup with timemachine everthing works fine and the computer boots into Lion. Rebooting in Windows is working, but again when I reboot into Lion it stops at the Apple logo. Anyone can help me fix this ?
Greetz
Dimi

I have trouble understanding
When or how ?
When you SET LION to be the default startup disk / OS from Windows Taskbar? from Windows control panel "Boot Camp" where you can also set the default?
If you have any external drives, disconnect them, and anything else.
If you set Lion to be the default in Lion System Preferences control panel "startup disk" - then boot into Windows using Alt or Control panel, then let it restart itself and go into Mac OS X.
Normally trouble booting Mac OS is due to a check disk going on, dirty file system journal directory or from forced hard restarts.
Boot into Recovery Partition Mode and check your partitions and repair. Command R
There are details though that are probably missing.

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After the installation of win7 with bootcamp Lion stops booting at apple logo. Any help to fix this ?

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