N900 no wifi

Factory resets already done. SSID is broadcasting. wifi light is on. Tried reflashing the firmware.  NO luck. Wireless doesn’t broadcast, except for very random minute periods after first powering on (and that hardly happens as it is). GUI says that everything is on.  Any other ideas as to what I can try? 

Have you verified if the problem happens with the 2.4 and 5.0 GHz frequencies?