Loud buzz and power being dropped

Hello, i have a i.8 Ghz and lately i have been having a few problems. At first, my iMac would make this high pitched buzz whenever i would put it to sleep. Now, it makes the same noise when i first boot up, during the startup mac noise.
Another problem i have been having is my iMac will shut off randomly. The only way i am able to turn it on again is if i unplug the power cord for about 10 minutes and plug it in again and start it up.
Help Please!

Hello phishy91
Welcome to Apple Discussions
Contact your local Apple Service Provider or Apple Store, that sure sounds like a failing power supply which shouldn't cost more that a bill and some change to replace.
In the mean time, reset the iMac's SMU exactly as described step by step in the following link to see if that helps. > http://support.apple.com/kb/HT1767
Also see the following Apple Discussions thread were if I'm not mistaken, Apple replaced an iMac G5's power supply for free? > http://discussions.apple.com/thread.jspa?threadID=2002913&tstart=0
Dennis

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ntdll.dll however seems necessary for Win7 to boot.
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Is there some way to have both versions of the DLL file in the system32 folder (bypassing the "cannot have two files with the exact same name in the same folder" thing) or rename the original DLL's something else and somehow make the CMS look for
the new named versions so the system has the updated DLL's it needs to boot/run and the CMS has the old ones it wants to run or is there someway to have a self contained install of the CMS, say on a USB flash drive and give it it's own E:/windows/system32/needed
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Willing to try any other options or settings you may have come up with as well.
Thanks again for your reply and my apologies for not answering sooner.

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