GTX-970 Issues

[Nrick]

So, I'm just wondering is there any particular reason my GTX-970 will cause my computer not to boot?
It's a Zotac GTX-970 card and works fine in my brothers computer but not mine. The computer will not pass the post screen, when powered on it beeps 4 times then goes to a black screen and will sit there until powered off. Could it be an issue with my psu not being able to supply sufficient power to my system? I have a 550W power supply with 28A on the +12v1 and 20A on the +12v2. There is 15A on the +5v and 24A on the +3.3v. Previously I had a AMD Radeon HD 7790 Dual X-OC oveclocked to 1200mhz without any issues.

System specs:
Windows 7 SP 1 64bit
AMD APU A6-3650

8GB RAM

1TB HD

120GB SSD

There is also a wifi card in the system and a Sound Blaster Sound Card.

 

Edit: Tested a larger power supply (630W) and still did not get past post screen. APU drivers are uninstalled. 

[Firearm2112]

maybe its because the APU is enabled?

[Nrick]

maybe its because the APU is enabled?

I uninstalled the APU display drivers when I installed my HD 7790, I will give it a shot though and check to see if they are enabled. Will update my post later tonight. 

[Nrick]

I have fixed the problem by upgrading components in my computer, I am now using an MSI Z97 mobo and an intel i5 4590 processor. Everything works fine now.