I forgot to mention it is a Desktop unit. I got a little impatient and frustrated. Noticed there was a slight lift in part of the panel, so I slipped a straight-edge screwdriver and slowly moved my way to front and back side of panel edge with screwdriver and lifted. Finally got panel to give. After having removed, it turns out this panel isn't the same as the others. It has a clip in the middle of that edge instead of the grooved slot. Not sure why it had different panel. Out of warranty so not going to care at this point. Have the panel now working to remove with pull mechanism. Thanks for the reply though.