So finally, after 2.8 years of service, my 7870 gave up on me.
I was playing counter strike global offensive and suddenly, there were some blue lines on my monitor with an audio boot loop, so I restarted my pc, and just after the windows 7 boot animation, the display goes dark and nothing happens, I can hear my windows boot sound, as PC is running fine on the background. Just to check, I reinstalled windows, and then, without installing the driver everything seems to be perfect and working fine, but just after I installed my gpu driver 15.4 and restarted my pc its the same thing over again.
Im just sharing my experience, if any of you had a similar experience do let me know in case you found a way to fix it.
PS: I already assumed its not repairable, so I want to sell it.