I just got a Sylvania Tablets 7 in with 2.2 off some one, and it was working fine until i started installing apps , now it wont go pass the slide to unlock screen..

I tried using a mouse and keyboard but it did now work .I also tried to reset it but i get "No recovery image is found, try recover from SD" . what sould i do?

I tried using a mouse and keyboard but it did now work .I also tried to reset it but i get "No recovery image is found, try recover from SD" . what sould i do?