psp prob adhoc error WLAN lost

  i have a prob with my psp.... i have a psp phat ver.5.50 prome4 but my adhoc is not functioning, it happened after i have changed my memory card slot, i checked on the web for a solution and i had downloaded and run a mac fixer but after that i can't open my WLAN now... it only says that my WLAN is not turned on but it's already turned on... can anyone help me with my prob... without changing any parts of my psp??? tnx....