BB Bold :: WIFI Connected But Not Working?

i have tried everything under the sun and the problem still exists.my problem: my bold 9780 is connecting to my wifi but won't use the connection when browsing the web.

i don't understand and it's quite annoying why it won't work as it did before. i've even spoken to orange and sky to try and solve this problem and still nothing.

whenever i browse the web on my blackberry via the browser through wif the pages never load. it's actually quicker to disconnect from wifi and use 3g then wifi. my blackberry was working fine before why has it stopped working. this has to be fixed as it's a pain!

i've tested other wifi spots and i have the same problem so i know it's not my router. i removed the security on my router but still no luck. i've done a master reset on my blackberry and still the wifi will not work. i've even had the handset replaced and still the wifi will not work!

the blackberry connects fine to the router and its shows as connected to the router but it just refuses to load pages when wifi is on. it gives me an error message:

"unable to find the requested server"when wifi is on and i try to browse the double headed arrow icon in the top right should be on when using the wifi, but it hardly appears at all when the pages attempt to load it should be on constantly when loading pages through wifi.

i can't even see Internet videos it keeps buffering the gives me the same error message as above.