Nipun_3 :
i will now surely get a new cpu cooler but there is another problem. the screen looks all fuzzy when i use the gpu but when i remove the gpu and use display with motherboard it loooks normal. and as i said i took it to my friends home, on his computer there was no fuzziness whatsoever in fact the monitor was looking amazing. i do have all the up to date drivers and bios.
Your troubleshooting is helpful, it's too easy to blame the CPU overheating (max temp according to AMD is 70,
http://products.amd.com/en-us/search/CPU/AMD-FX-Series/AMD-FX-6-Core-Black-Edition/FX-6300/136 - don't be surprised if you ever switch to Intel, they can and do get a lot hotter) but your test there seems to demonstrate that's not really the problem (although you should try to fix that, it won't just up and die but it will throttle down). The GPU fan probably wasn't turning on because it's just not that hot. Nvidia cards can get really hot and be fine, I try to keep them under 70 myself but they can run hotter. The fact that yours is so cool makes me think that's the problem, maybe not enough power...
The GPU seems like it's good based on your test with your friend, the CPU seems like it's good (even if running hot) based on the quoted test. That really leaves the power supply not being able to power up the card (although when that happens usually you start getting things like BSODs but who knows), or the motherboard. How old are those components? My guess (and it's hard to say for sure because there are so many variables) is that the PSU is going bad. That particular PSU is not well regarded here either - https://linustechtips.com/main/topic/631048-psu-tier-list-updated/ and here:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html - that's an old list but it has the VS)
You don't need to spring for the best PSU in the world but in both those lists I'd avoid anything under Tier 3 as a rule if you're gaming.
Do you have a program that can monitor power use on your card? If not, something like MSI Afterburner will work, and try to see if it's actually drawing as much power as you'd expect it to. Perhaps download a graphical benchmark program like Uningine Heaven and crank the settings up to try and force the card to 100% power use. It would not surprise me if you immediately get a screen-full of nasty artifacts and then a hard crash or power off. Instead of pulling your GPU and taking it to your friends, see if he can bring his PSU over, that's easier to switch out and troubleshoot that way (edit: or actually, I guess that's not really easier. However, may also be enlightening to try his video card with your PSU too, although that may not be a good idea in case something goes really wrong, you don't want to damage his card).
Does your fuzziness problem happen all the time, or only when gaming?