Currently Being ModeratedAug 22, 2013 9:48 AM (in response to jackvane007)
There are a lot of things that could account for what you are encountering. The first thing I would do is check the WiFi signal strength and noise level from other sources including WiFi networks at your Mac mini's location. The fact your other Macs and PCs are working does not necessarily reflect conditions at the specific location of your Mac mini. Sometimes a distance of only a foot or two can make a BIG difference. If you don't already have one, there are a number of free WiFi scanner and and sgnal analyzer apps available from the App Store.