Problems with windows 7 installation

I installed my Windows 7 copy from retail disk (thanks to Lenovo's not-so-fast upgrade program) and I'm having the next problems:
- Switchable graphics doesn't work, it shows both energy saving and high performance in power manager but even if I click high performance it won't change it (worked fine in Vista with same bios settings)
- No sound at all, even after I installed the driver from Lenovo's site (worked fine in Vista)
Anyone, help?

Now this is more like it. 
Apple's new discussion format, unfortunately, does not allow for any user to give full model info unless said user selects "Other" in their profile. 
We need at least the time frame in which your iMac was built (say, Mid-2010) so that we can drill through some possibles.  Any further specs you know are also welcome.
Be aware that the 2006 iMacs (the snow-white models) are not and will never be blessed by Apple for Win 7 (http://support.apple.com/kb/HT3986), though many of these models may meet recommended hardware requirements.  The same would apply if this were a 2006 notebook.  In either case, it's "use at own risk."
All firmware updates must be in place for the remaining Mac models to support Win 7.  For some iMac 2007 and later models, video firmware updates were also issued to address specific issues not Boot Camp-related. Use Software Update to get these and other suggested fixes, before you do much else.
Once these are in place, check your Windows source.  We have heard a few reports of authentic Win 7 ESD images not burning properly on Macs and thus not operating as they should.
Other than that, you can use my recent guide as a framework for loading Win 7.
Nate

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