My computer won't detect my sound card

I have an ESS Solo-1 sound card (onboard) on my compaq 5440 (crap!). It used to work just fine but for some reason the computer does not detect it anymore. The only thing I did recently was put in a new Video card (voodoo 5 5500 PCI), and after I did this the sound could not be detected. I don't understand why this is happening because I did not do anything to the sound, and i didn't fiddle with the BIOS. Also, there is a jumper on the motherboard to disable the onboard sound, but I didn't touch that either(and it's enabled in the jumpers). Does anyone know why this is happening and how to get my computer to play sounds again?

You might try this. Boot to safe mode, go to device manager in the control panel and delete all references to the sound card.
There may be multiple entries. Then do a normal boot and see if it detects the sound card. Other thing to try is the add new hardware wizard in Control panel. It can often pick up devices that aren't detected on system boot.

The device manager does not have any references to my sound chip and the Add new hardware wizard cannot detect it.

Then enter the BIOS and verify if the sound chip is enabled.

I would have done that, but the thing is that my compaq doesn't have the option to enable it or disable any of the onboard stuff in the BIOS. I think I saw a jumper on the motherboard for the sound chip, and it said it was enable (It said 1-2 for enable, 2-3 for disable. It was on 1-2)