Member Avatar for Nemesis

I have a Dell OptiPlex GX110 and when I start it up it keeps telling me this warning. I want to stop it from saying that until the cover is actually removed.

Thanks again!

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  • Latest Post Latest Post by jomar19

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The OptiPlex GX110 message is the chassis‑intrusion feature telling the firmware the cover was opened at some point. was right that the firmware holds a record you can clear or change — Dell’s support note for OptiPlex GX100/GX110 shows the exact Setup steps (press F2 at the boot prompt, open System Security, look for Chassis Intrusion, then Clear or change the behavior). This is the cleanest, supported fix when the cover is properly seated. Dell: Reset or remove “Alert! Cover was previously removed”. (dell.com)

If the warning keeps coming back even after clearing the flag, check the hardware switch/cable. The GX110 uses a small chassis‑intrusion microswitch on the control panel; a stuck switch, a disconnected cable, or a damaged clip will keep the system reporting “opened.” The service manual shows how to remove the control panel and access the intrusion switch so it can be inspected or reseated. If the switch is physically broken it should be replaced; as a temporary measure only, making sure the switch is held closed will stop the alert (but reduces physical security). GX110 service manual. (manualslib.com)

For the newcomer asking “What is CMOS?”: CMOS refers historically to the small battery‑backed memory that stores BIOS/firmware settings (date/time, boot order, small configuration flags). Repeating: clearing CMOS or removing the battery will reset saved firmware settings and can clear stored intrusion logs, but it also resets any custom BIOS settings and may clear BIOS passwords — so follow the manual and back up any settings first. General CMOS background is covered in the linked explanation. (lifewire.com)

Recommended order: verify the cover/switch physically, enter Setup (F2) and clear or disable the intrusion flag per Dell’s instructions, and only if Setup is inaccessible consider the hardware/manual CMOS clear route. Keep intrusion enabled if the machine is in a shared/managed environment.

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Member Avatar for Thong_Ispector

It will continue to report that the case was opened until you go into CMOS and clear the case open report.
You should even be able to turn the check for case open feature off.

Member Avatar for Nemesis

Got it! Thanks....

Member Avatar for Thong_Ispector

No Problem...

Member Avatar for ahmedabad

It will continue to report that the case was opened until you go into CMOS and clear the case open report.
You should even be able to turn the check for case open feature off.

What is CMOS !! I am not a computer wizard. Please explain in detail. Thanks

Member Avatar for jomar19

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