Cannot Wake Mac Mini

Hi there team,
I use a Mac Mini as an itunes server. It is an intel 2.0Ghz model Macmini2.1 which used to run fine under Snow Leopard.
I installed Lion on it after upgrading the memory to 2Gb but is has started refusing to show anything on the video monitor.
The only way I can make the monitor work is to power the unit off and on again.
I didn't think to check but I believe it might still work when accessed from my iphone and ipad and streams OK to my Airport express (But I need to double check this)
I have set the computer sleep to "never" in the energy saver section of system preferences.
I don't run any other apps on it. It just connects to my music library which is on an external firewire disc.
I think the only reason I upgraded to Lion was because I was a mobile me customer forced to migrate to icloud.
Anyone else have this issue ?
Cheers
Lizardpoint

Thanks Tim, just check and I'd already "checked" that option too.
Since I'd got the Mac Mini G4, running in parallel, which can put to Zzzz and wake up anytime without any problem since Day One !
Regarding my new Mac Mini INTEL ... I tried to erase, to reformat, and to reload the whole OS 10.4.5 and the problem persist :< !
IMHO ... I believe this maybe variations or bugs on ARD Clients 2.2.1 (INTEL) and ADR Clients 2.2 (PPC) ...?!
Let's recap ... Within a few minutes that I put my Mini INTEL to Zzzzz ; its possible that to be woke up using Apple Remote Desktop from my Pismo ... but after a while ( did not have patient to measure that ) say, 30min ... I can only wake it up by means of physical touch e.g. touch any keyboard or mouse button or using the wireless Apple Remote Controller !
Kindly can anyone please to test it out?!

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