You got one long beep, but was there any thing displayed on the monitor?
Like checksum error, or anything else.
Replacing the battery could very well solve the problem, but once this is done, you would have to enter the motherboards BIOS setup utility to correct the date and time and load system defaults.
If you need further help with this procedure, please come back and request that information from us.
I also own a Dell computer with the same clamshell case you speak of, so I know what you're talking about.
If replacing the battery and loading system defaults does not work, then we will have to figure out what the beep codes means.
I want to caution you, any time work is performed inside a computer, you need to keep yourself grounded to the computers metal case at all times, static electricity from your body can permanently damage the sensitive electronic components found inside a computer. I also suggest disconnecting the power wire from the AC outlet as well.
Edited by MrBruce1959, 05 April 2010 - 12:23 PM.