I cannot get my iMac to go to sleep. It always wakes up in a few seconds

When I try to put my iMac to sleep, it will "sleep" for a few seconds and then it goes back to the desktop.
I am also having trouble with the screensaver not wanting to go on after the correct minutes.
I have instralled the LION a few weeks ago and it first was working fine, and now I am having this "sleep" problem.
Anyone out there knows what is going on?

We've already done all of that. And we used the same thunderbolt cable to connect two iMac's and that worked totally fine doing the Command+ F2. I don't understand why we can't get the macbook to do the same.

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Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
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The box;
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THose early Epson USB drivers could be pretty pernickety, and even more so when used with a serial to USB adaptor. I see HERE, that there are a couple of "Driver updaters" available for use with the iMac etc. It may be worth trying them. THere is also some relevant information on the Epson site at http://www.epson.com.sg/other/help/inkjetcommonfaq.shtml
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