So I start to make a new rig, I didnt bought everything I need more RAM and a GPU, but I decided to turn it on just to make sure everything was fine, but then it start shutting down for no reason, I had an old HDD with windoes 8 and it seem to work fine, but in windows 7 is making the system shut down sometimes without warning I had to Hard Reset my PSU everytime it happens if not my PC won't turn on again, my dad was about to play candy crush xD and it shut down, I played minecraft and nothing happend, I try to run speedtest.net and it shutdown, So i dont know what is causing the problem any help?

Specs

4gb RAM DDR3

Phenom ii 6x Black Edition 3.2ghz

Diablotek 600W

Aerocool X strike

Corsair H100i

Toshiba 1tb

K so let me get this straight, you have a new PC with an old hard drive and in windows 8 mode, it boots but in windows 7 mode, it doesn't boot?

Was Windows 7 already installed before u got ur new computer or did you do a fresh install of windows 7 when u got the computer? Also, whats ur current GPU on that PC? Another thing to note is to make sure Windows 7 is activated or else it will shut down automatically if its not a "genuine copy"/unactivated

Sorry, my old HDD has windows 8 and it boots perfectly, but in the new one with windows 7 boots, but then after sometime it shutsdown. I am sure is not my HDD, or temp, is running at a good temp, if it was my PSU why is still running fine, I ran minecraft and it works okay, but I put Candy Crush and shutsdown ._________.

Did you try running anything else and see what happens? Maybe its a glitch? Heck, I didn't even know you could get candy crush for windows 7. You sure its not a virus?

I re-install everything still happened D:, there has to be someone here that had a problem like this, I am thinking it may be my Power Supply.

It may sound stupid, but FLASH GAMES or FLASH things are causing the problem o.o

just dont play flash based software

EDIT: all drivers up to date?

Don't play candy crush... But seriously, seems like a software bug. You have a new HDD? Mayby re-instal your OS?

Did you accidently unplug the CPU fan's cable etc? What do the temps read?

Try putting your hardware under load e.g Prime95 for 100% cpu load and FurMark for 100% GPU load to see if your power supply is the problem. etc.

if its running with windows 8 under load there should be no problem with the powersupply(and its not a to small powersupply, 600w should be easyly enough)

try other browsers, mb flash isnt the problem.  

and are u sure its not the HDD?  install linux and try to use flash on the new HDD.