This computer only has one space for a 2.5" hard drive (IDE ATA100). Unplug all external cords from the computer (including the power cord) and press the power button (this grounds the system board). Remove the mounting plate and cable cover if these are attached. Place the unit on its side with the back connectors towards you (power supply to the left) and slide the release button towards the right. The hard drive door should open. Ground yourself by touching unpainted metal on the case. Rotate the door up and remove the data cable from the drive (carefully). Raise the release tab (on the opposite side from the data cable) and pull the drive up and away from the door. If you need to, remove the sled from the old hard drive (4 screws, 2 on each side) and attach the sled to the new drive. (If the new drive came with a sled, skip this step.) Slide the new drive onto the drive door. Attach the data cable carefully to avoid bending the pins (just the ribbon section is used, the other 4 pins are left bare). Slide the drive into the drive bay and lower the door to lock it into place. Replace the cord cover and mounting plate if in use and connect all of the external cables. Plug the network cable into the wall jack, router, or modem before connecting it to the computer. Follow the directions that came with the drive for any software installation. Reboot the computer, partition and logically format the hard drive. See the OS documentation for this step. Test the hard drive by running the Dell Diagnostics,
http://support.dell.com/support/edocs/systems/opsx270/en/ug/adtshoot.htm#1172888 . Install the OS for your system.
If the chassis alert comes on at the next reboot, reset it (contact IT if there is a password on the BIOS).
I hope this helps.
Cindy Wells
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