Successfully installed Yosemite 10.10.1 on an AMD FX-6300 system - How do i update to 10.10.5?

[CheetahLoad]

I have everything working, except for sleep.

Sound, video, network all is working fine.

 

But how do i upgrade the OS to v10.10.5? Could anyone help me?

I tried installing the combo update, replacing the kernel, then replacing system.kext.... but no avail. Just keeps rebooting.

 

This is my current system: 

Mobo ASUS M5A78L-M LX/BR (all USBs work, as well as the DVD drive);

CPU AMD FX-6300 3.5GHz (Shows as an Intel Xeon in "About This Mac");

8GB DDR3 1600MHz RAM (Shows as DDR3 667MHz);

GPU XFX Radeon HD 6450 1GB DDR3 (works perfectly, with full QE/CI support).