Graphics Card computer diagnostics?

SlayerTAG

Honorable
Aug 11, 2012
15
0
10,510
A diagnostic from a computer repair place. My computer had been messing up alot lately and they are narrowing it down to a motherboard issue but i was wondering if i could possibly be a Graphics card problem.
 

SlayerTAG

Honorable
Aug 11, 2012
15
0
10,510
Freezing when i get on, can not play games because of freezes so frequent.
Full Specs for the most part

Gigabyte GTX 550i 1GB
Intel Core 2 Quad 8300 2.4GHz Quad Core
8 BG DDR3 1066
RaidMax 750 Watt
P5G43T-M Pro Motherboard
500GB Sata by Western Digital
 

SlayerTAG

Honorable
Aug 11, 2012
15
0
10,510
upgraded about 5 months ago, worked fine. Then i had to replace the network card and the hard drive became defective. Replaced those and has been freezing since.