* Check POE at the AP (you can plug in to the console port of the AP to see the output and if it's not enough power it will say so, or if you see the LED stay Red after powerup, then you know it's a POE issue (you need 802.3at with LLDP support on the swtch, or you can use an 802.3at power inejector, POE+ or 30W 802.3af is not supported)
* Check your version of code, and if need be, upgrade the DRT file if you can't upgrade AOS firmware should it be needed. Doing a 'show ap allowed-channels country-code fr ap-type 275' and should see the following. If not, you need updated firmware or an update to the DRT
#####
(Aruba7005) # show ap allowed-channels country-code fr ap-type 275
Allowed Channels for AP Type 275 Country Code "FR" Country "France"
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PHY Type Allowed Channels
-------- ----------------
802.11g (indoor) 1 2 3 4 5 6 7 8 9 10 11 12 13
802.11a (indoor) 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140
802.11g (outdoor) 1 2 3 4 5 6 7 8 9 10 11 12 13
802.11a (outdoor) 100 104 108 112 116 120 124 128 132 136 140
802.11g 40MHz (indoor) 1-5 2-6 3-7 4-8 5-9 6-10 7-11 8-12 9-13
802.11a 40MHz (indoor) 36-40 44-48 52-56 60-64 100-104 108-112 116-120 124-128 132-136
802.11g 40MHz (outdoor) 1-5 2-6 3-7 4-8 5-9 6-10 7-11 8-12 9-13
802.11a 40MHz (outdoor) 100-104 108-112 116-120 124-128 132-136
802.11a 80MHz (indoor) 36-48 52-64 100-112 116-128
802.11a 80MHz (outdoor) 100-112 116-128
802.11a (DFS) 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140\
#####