When I turn on my TV/AV receiver my Mac mini goes to sleep!?

This issue occurs regardless of whether the Mac Mini is in sleep mode or awake...
I have my Mac Mini connected to my HDTV, therefore I connect using an iPad as a remote.
When I turn on the TV and receiver (Onkyo), the Mac Mini will go in to sleep mode, even after showing the desktop with no problem (moments later it will turn off). This makes it very hard to wake up using any iPad apps, because even using wake on LAN functions these seem to have little effect. On some occasions I can use wake on LAN and this works, however most of the time this is unsuccessful. If the Mac Mini is already in sleep mode, I will of course have the same problems.
My main issue is that this is only started happening since upgrading to mountain lion and there was no problem before using lion.
Is anyone experiencing these issues and/or have any suggestions?

Try restarting you computer by holding down the option key, this should give you the option to select your startup volume, select Macintosh HD. 

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