lets not all reply at once.....

i have a p735, and the screen goes white on me.... at first it would happen every few times i opened my phone... then it did it everytime i closed it, so i would turn it off leave it alone for a few minutes and turn it back on and it would be working again, until i closed it.... so i called t-mobile and they told me to send it in but i would have to pay 100 dollars to fix it... so instead of that i went to a little place out here that fixes phones and they said thy fixed it, but they didnt..... they made it worse!! now, as it starts to turn on, the screen fades white and flashes a few times.... so i tried to see what was wrong with it so i took it apart..... and put it back together and still did not fix it.... so what do i do now........ do you think i should buy one for parts or what?? im confused....