Need help with a new build, is shuttingdown!

[Jizz_Beard_thePirate]

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