Sound missing after RAM upgrade.

Hi, i've searched around and couldn't seem to find any post similar s
sorry if i'm repeating..

i've just upgraded from 2x 1gig to 2x 2gig (totaling 4gig ram).

everything seemed OK, booted correctly and vista (in system props
shows 4gig ram

however i appear to have lost my sound completely...

the sound icon says No Audio Output Device is installed... checke
device manager and theres no sound card listed... its an onboard soun
card, i've also already tried reinstalling the driver

if i put the old 2gig back in, it works no problem. but as soon as
add the 2x2gig sticks the sound goes

My mother board specs can be found here:
'MS-7255-150 MSI VIA P4M890M2-L, 8CH Audio, LAN, VGA Via Unichrome Pr
1066 FSB 16X PCI-e, 2xPCI, 1xPCI-e 1x, 2xDual DDRII533, 2xSATA...
(http://tinyurl.com/7clpqd

and the ram i have installed is

Kingston KVR533D2N4 2GB 533MHz PC4200 DDR2 RAM Non-ECC CL4 DIMM. whic
as far as i can see should work with my mother board

i'm not a real computer wiz, but have never had a problem whil
upgrading RAM. does anyone know if there is anything i can do to get m
sound working again?

Thank

JM


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JMC05