Because you lost the configuration of your computer when you changed the battery. You have to go into the setup menu and select the devices that your computer have.
SOURCE: Not able to find any drivers for Dell optiplex 755 for windows server 2003 OS
Welcome to FIXYA
there are a few websites i use might like to try them
drivers.com is a good one and driversupdate.org is also a good one
hope this halps you out ...have a good day:)
SOURCE: dell optiplex 755 does not recognize the dvd-rom
Try the fix listed here - the Fix It image.
http://support.microsoft.com/kb/314060
SOURCE: does a firmware update for dell optiplex 755 optical drive fix
dell 755 drivers page
your looking at the wrong firmware
optiplex 755 current bios version: A10 date 6/20/2008
for the CD Drive need to open device manager and check
what brand and model you have for dell used 2 DVD drives
sony and teac
use the correct firmware on drive, if not the drive will be killed.
if unsure open case and look for name/model on sticker of drive
SOURCE: the OPTIPLEX 755 will not start
Open the case and look at the little black round things that look like soda cans. Those are called Capacitors. they are kinda like small batteries. They should have a shiny silver top. If they have anything oozing out or if they look like theyve popped like a popcorn kernel, then you have a faulty board. If your pc is under warranty, call dell asap. its an easy repair and its done the next day.
SOURCE: My Dell Optiplex 745 "No Boot Device Available"
No boot device means that the computer cannot find a drive that has a operating system files and therefore cannot boot up.
This usually means that the hard drive in the computer is faulty.
You need to get a new hard drive and install Windows on the hard drive, together with the drivers for the computer's installed devices and programs to get a working computer.
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