You probably need to update or inatall a driver for your sound card. If your Compaq came with the Creative Sound Blaster you can get the driver from www compaq.com or from Creative.com If not you have to find the model number for your sound card
should recognize the cd rom /dvd unit automatically
lower picture is of the c300 cd unit
anything look different from the original ............lowest picture
CRX880A Compaq Presario C305LA C508US C551NR Optical Combo Drive CD-RW DVD- ROM
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