Up-Grading HPa6157C Desktop?

I bought this computer from fry's electronics and here are the details of it:





Refurbished - HP a6157c


Operating System - Genuine Windows Vista庐 Home Premium 64bit w/ SP1


Processor - AMD鈩?AMD Phenom鈩?Processor 9650


Processor Speed - 2.30 GHz


Memory - 7GB PC2-6400 DDR2 SDRAM


Video Graphics - Integrated on Motherboard


Hard Drive - 750GB (7200RPM) Hard Drive (SATA)


Optical Drive - SuperMulti DVD Burner with LightScribe Technology


Card Reader - 15-in-1 Digital Media Card Reader (SD, MMC, RS-MMC, MS, MS Pro/Duo, Pro Duo, SM, xD, mini SD, CF I/II, MD, MMC Mobile, MMC+


Audio - High Definition Surround Sound Capable, 8 channels


Network - 10/100 Ethernet (RJ-45)


Keyboard - HP multimedia keyboard





What I wanted to know is my computer states it does not have a sound card when I tried to put in the speakers. So I cannot set any sound. What type of sound card should I get and where and also how much memory can this computer hold. The HP web site states only 4g, but I have 7g kinda confused.Up-Grading HPa6157C Desktop?
hi enjoy, your the newer computer has their sound cards set in motherboards so i recommend that you call where you bought your computer they will direct you to where you should do to get your sound card installed but lean toward soundblaster if you have five speakers get 5.1 i like soundblaster extreme wifi 5.1 that is the best advice but if they cannot help then take your twoer to a comuter repairman he will look at your system and he will know how to get you up and going. good luck hope i was helpful to you