OS 10.8 just installed. "Hot Corner" to put new iMac 2.7 GHz Intel Core i5  to sleep mode doesn't work. Have tried cordless and corded mouse with same result. Momentary sleep, immediate wake. Any idea how to fix?

Set "hot corner" to put iMac to sleep.  Doesn't work.  Selecting the corner will momentarily put to sleep, but immediately rewakes.  Have tried all four corners with same result.  Have tried with wireless mouse and with corded mouse with same result.  Any ideas as to how to fix?

You've been so great, I want to thank you for all the help over a very frustrating day.  Last evening, I redownloaded and installed the fresh copy of Mountain Lion.  The problem remained.  After installing the new OS 10.8, any clicks on a web page (Firefox browser) didn't open the page, but instead made a copy of the page on the desktop. Felt it must be hardware  degrading, so I set up a case with Apple support for today.  Early in the diagnostics, I had swapped out for a corded mouse and the problem remained.   As a last try, I changed out my wireless mouse for a different wireless mouse. That seems to have done the trick. My Logitech mouse is incompatible with OS 10.8.
Thank you again, so much!
.../awards rkaufmann87 500 points!

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