...try to get it to connect w/o any security. After that point, try adding it on. The wifi frames are certainly a bit flaky to work with.
I actually found some useful tips over at Amazon in the user review sections for different models. In some cases a firmware upgrade may solve connectivity issues. YMMV. Good luck.
My Samsung Digital Photo Frame SPF 105V (on the box) or LCB10QSSSID (product information displayed on the frame) fails to connect to my wifi modem. The frame sees the correctly named SSID on the Choose Your Access Point screen but fails to connect (even when sitting beside the modem, so it's not a signal issue. My laptop connects fine. I'm wondering is it a wifi security issue. My wifi modem is set to use WPA/WPA2.