Replace Drum light will not go off

I have the Dell color laser printer model 3000cn. Today while printing my printer had a message of "Drum full of waste toner, replace DrumCart 091-935"  with the exclamation notice/error light on so I already had one on hand and replaced it with a Dell Drum. Now the notice/error light will not go off and I can not go any further. Can someone help, please?

I have tried unplugging it and restarting but that didn't work.

Thank You,

Charyl