Thanks for the help Guys.
I did following.
1. Replaced Stock Cooler with EVO.
2. Cleaned and reapplied New TIM that came with EVO.
3. Acetone used while cleaning it and worked like charm. CPU removed from Mobo before removing TIM as acetone reacts with certain plastics so didn't wanted to take risk.
4. Replaced the Non function rear exhaust CM 120 fan with Sunbeam 120 mm 21 db Fan.
5. Removed dust and cleared the cable clutter a bit.
6. The side panel Chimney thrown to dustbin.
Problems:
1. I can't figure out how to remove the Front Fan of the CM Elite 335. No Clue how to access it as from the looks of it, it needs to be accessed from front which is covered.
Gains:
1. CPU Idles at 37 Now. Prime 6-7 Mins and it stabilize at 52 Deg. This is WAY To LOW as compared to earlier temps.
2. HDD Temp came down by 12 Deg to 35 Deg Odd. This will further reduce if I can fix replace that damn front Fan as it is required to Blow the Air on HDD and GFX. 560 Ti is still awaited and will come tomorrow.
nvm I got the Front Fan fitted. So Front is Inlet and Rear is exhaust.
@ Sam you said 3 Fans are needed. Do you mean 3 Case Fans? There is only provision for 2. I have to Mod the side panel to fit 3rd to blow air on GFX