Computer Crashing

I went to best buy and my psu is working perfectly. I guess they think its my GPU.
 

My Computer

OS
Microsoft Windows 7 Home Premium 64-bit
CPU
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz
Motherboard
GIGABYTE GA-790XTA-UD4
Memory
G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 1280
Graphics Card(s)
ASUS 5870
Sound Card
Creative Sound Blaster X-Fi Titanium Fatal1ty Champion Serie
Monitor(s) Displays
Acer P235Hbmid Black 23" 5ms HDMI Widescreen LCD Monitor
Screen Resolution
1920x1080
Hard Drives
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA 3.0Gb/s 3.5"
PSU
Antec TruePower New TP-750 Blue 750W
Case
Antec Nine Hundred Two
Cooling
4 case fans
Keyboard
Razer Arctosa
Mouse
Razer Imperator
Internet Speed
Cable 10Gbs
First try my solution before spending more money on a card or anything else they attempt to have you buy.
 

My Computer

Computer Manufacturer/Model Number
Barebones
OS
Windows 7 Home Premium 64bit
CPU
AMD Phenom II X6 1090T Black Edition Thuban 3.2GHz
Motherboard
MSI NF980-G65 AM3 NVIDIA nForce 980a SLI
Memory
G.SKILL Ripjaws Series 8GB (4 x 2GB) DDR3 (PC3 12800)
Graphics Card(s)
SLI GeForce GTX 480 (Fermi) 1536MB 384-bit GDDR5
Sound Card
onboard
Monitor(s) Displays
Toshiba TV 42'' or 27.5'' widescreen monitor
Screen Resolution
1920x1080 60hz
Hard Drives
2x SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/
PSU
Antec TPQ-1200 1200W Continuous Power with PowerCache
Case
COOLER MASTER HAF 932 RC-932-KKN1-GP Black Steel ATX Full To
Cooling
1 x 140mm rear fan, 3x 230mm Fans (front, top, side)
Keyboard
Logitech G15
Mouse
Logitech MX 518
Internet Speed
13 mb/s down 5.5 mb/s up
Other Info
Main system.. other system is slightly different
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