Where is the sound card located in a dell dimension 1100?

The sound card is integrated into the motherboard of the system. It is not a separate card. Two usual things that are of interest are disabling the onboard sound and installing the driver to be able to use the onboard sound. I cover both below:

If you want to install a new card, you need to disable the on-board sound card. You do this with System Setup. This is described on page 83 of the user manual (click here for the manual)

Entering System Setup

1. Turn on (or restart) your computer.
2. When the blue DELLTM logo appears, press immediately.

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your computer (see page 47) and try again.


Select "Integrated Devices" and then select "Sound". You will be given the opportunity to disable the onboard sound capability so that i does not interfere with your new sound card.
Make sure that you Save and Exit from this setup utility to save your choice.

If you are trying to get the onboard sound card to work, then you will need to download the driver for this specific computer from the Dell support web site here: (Click here)

Select your version of operating system from the drop-down and then find the driver for the onboard sound card for your computer.

As usual, on board sound and graphics. So it hasn't actually got a sound card. If you wish, you can dissable the onboard sound and fit a nice card of your choice.
Hope this helps.

MPN DIM11P4MIN Key Features Form Factor Micro Tower Processor Intel Pentium 4 2.8 GHz Installed Memory 256 MB (DDR SDRAM) Operating System Microsoft Windows XP Home Edition HDD Size 80 GB Optical Drive Type CD-ROM • CD Burner Processor Processor Type Intel Pentium 4 Processor Speed 2.8 GHz Processor Manufacturer Intel Motherboard Bus Speed 533 MHz Memory RAM Technology DDR SDRAM Installed RAM 256 MB Max Supported RAM 1 GB Supported RAM Speeds 400 MHz Installed Cache Memory 1 MB Technical Features Integrated Input/Output Ports USB 2.0 x 6 • Serial Port x 1 • PS/2 Mouse x 1 • PS/2 Keyboard x 1 • Parallel Port (ECP/EPP/SPP) x 1 Expansion Bays 2 x 5.25" (External Access) • 1 x 3.5" (External Access) Expansion Slots PCI x 3 Power Configurations ACPI/APM Power Management Hard Drive Hard Drive Capacity 80 GB Hard Drive Interface DMA/ATA-100 (Ultra) Hard Drive Rotation Speed 7,200 RPM CD / DVD Optical Drive Type CD-RW Optical Drive Read Speed 48x (CD) Optical Drive Write Speed 48x (CD-R) Optical Drive ReWrite Speed 32x (CD-RW) Audio / Video Graphic Processor Intel Extreme Graphic 2 Networking Networking Type Integrated 10/100 Network Card Data Link Protocol Ethernet • Fast Ethernet Dimensions Width 7.25 in. Depth 16.75 in. Height 14.5 in. Weight 23 lb. Warranty Warranty 1 Year Miscellaneous OS Certified Microsoft Windows XP Home Edition • Microsoft Windows XP Professional Product ID 28965079 Family Line Dell Dimension

The sound is integrated onto the motherboard in this model, it isn't a separate card.