My screen goes black after playing games

My screen goes black after playing games such as Bejeweled 3 and Zuma's Revenge. The games play fine but when I close out of the game my monitor goes black for 5 to 10 minutes before my desktop reappears. These games change my screen resolution and it appears that it goes black while switching back to the monitor's native resolution. I replaced the old GeForce 8600GT with a new video card and got the same results. I tried a different monitor too and that didn't help. I've flashed the BIOS to the newest version. I've run the newest version of Memtest86 with no errors. I built this PC in March of 2011 and hadn't had any problems playng these games until about 4 weeks ago.
My system:
Athlon II X4 645 (stock)
Gigabyte 870A-UD3 rev. 2.1
8GB G.Skill PC3-10700
Asus HD6570 w/1GB
Antec Neopower 650W
Acer 22" monitor (x223w)
Windows 7 Pro 64 bit
Any ideas would be greatly appreciated.
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  1. Thanks for the help but I've found the answer. An update to my Comodo Firewall was the cause of the problem.
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