Open lid
remove cables from HDD
if is with factory caddy it just slides out (blue caddy)
move plastic tabs of caddy inward and it just slidesout
some PC were modified here and I can not see yours now.
SOURCE: dell optiplex 170L hard drive recognition
Ms Driver gets flaky sometimes. Get New driver from Dell Downloads.
Contact Dell Support for more INFO
SOURCE: Dell Optiplex Gx280 - cant detect two IDE hard drives
Hi,
You should attach two hard drives on primary ide. Set both jumpers to cable select ( or one on end is master, middle one is slave). The one at the end of the cable is where your o/s should be. You could try putting the third on seconday, along with your dvd rom.
Hank
SOURCE: SATA Hard Drive Type The Dell Optiplex GX280 Takes?
Hi,
It makes no difference providing the computer motherboards support SATA interface.
SATA 1 and 2 drivers are in the BIOS. If all the computers have SATA 1 you can upgrade the BIOS to latest version via Dell's support website.
Regards.
Testimonial: "thanks, ill look into that. how do you update the bios? (i have never had to do it before) do you burn the update to a cd/floppy and boot from it? Cheers again!"
SOURCE: Dell optiplex 780 shutdown automaticaly
The desktop could be overheating and shutting down.
To fix this problem, please click on this link :-
Energy-Conscious Features:
The OptiPlex 780 offers Dell Energy Smart power settings and optional
high-efficiency power supplies on select configurations. The Dell
Client Energy Savings Calculator also lets you estimate energy usage
for multiple customized OptiPlex systems. 
ENERGY STAR® Compliance:
As an ENERGY STAR-compliant partner, Dell has designed select
configurations of the OptiPlex 780 to comply with ENERGY STAR 5.0
standards for energy efficiency. 
High Environmental Standards: Select configurations of the OptiPlex 780 qualify for an EPEAT®
Gold rating. Gold is the highest standard in the Electronic Product
Environment Assessment Tool (EPEAT), a set of performance criteria for
evaluating electronic products' environmental attributes in both public
and private sectors.
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