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My pc sound doesn't work always

my pc sound doesn't work always but sometimes it work it's a onboard realtek HD sound chip.i checked both my sub & HP they work fine & also not anything wrong in device manager.all drivers were up to date.any one please help me! is this a driver fault or hardware fault?

my pc spec:
intel dh61ww motherboard
intel i3 2100 3.1ghz processor
kvr 4gb 1333mhz ddr3 ram
asus gts 450 vga
seagate 1 TB hdd

software:
win 7 64bit ultimate SP 1
realtek driver version 6.0.1.6662 latest
nvidia driver version 296.10 whql (i have serious issues with 301.42whql drivers)

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