How to stop my macmini going to sleep?

My late 2010 macmini 4,1 has a habbit of falling asleep at the utter worst times and randomly. It is a little unusual in that it is used as a HPTV, with a Panasonic LED TV attached over HDMI, an Apple bluetooth keyboard and a Microsoft bluetooth mouse. Networking is via Ethernet on a static IP. The problem happens with all powersaving options set to "never"...
OS is 10.7.2. It will enter sleep mode right in the middle of typing on the keyboard, or when playing a video etc. Obviously this is annoying. Kernel log output is:
0 [Level 5] [com.apple.message.domain com.apple.afpfs.sleepState] [com.apple.message.signature asleep] [com.apple.message.success 1] [com.apple.message.value 1319140515] [Message AFPSleepWakeHandler: going to sleep]
Ethernet [AppleBCM5701Ethernet]: Link down on en0
0 [Time 1319141955] [Message Wake reason: OHC2
Previous Sleep Cause: 5
The USB device BRCM2070 Hub (Port 6 of Hub at 0x6000000) may have caused a wake by issuing a remote wakeup (2)
The USB device Bluetooth USB Host Controller (Port 3 of Hub at 0x6600000) may have caused a wake by issuing a remote wakeup (3)
EIR is supported.
SSP is supported.
HID tickle 91 ms
I've googled about and there seems to be some reports of this kind of issue back through the years, but no firm answered. Issue for me is I'm worried it is a hardware problem. I still have a month or so of guarantee left and wonder if I should take it into the store to get it swapped out?
I have a similar setup at work with a 4,1 mini, running 10.6 with a wired keyboard and bluetooth magic mouse, on a Dell TFT and that machine has no issues with sleep whatsoever.
Ideally I'd like to leave powermamanget enabled so it falls asleep after, say, 3 hours of being idle. But failing that I would settle for it NEVER falling asleep.
Lawrence

I have not found a definite answer but the following article might be of interest http://hintsforums.macworld.com/showthread.php?t=95016 this suggests the sleep cause 5 (a postive number) suggests the computer received a normal request to sleep.
I would suggest trying to reset PRAM and the SMC, if possible try running temporarily from a different hard disk (to eliminate a software problem).
See http://osxdaily.com/2010/03/24/when-and-how-to-reset-your-mac%E2%80%99s-system-m anagement-controller-smc/

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How to stop my macmini going to sleep?

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