Again, not to insult your intelligence, but I have seen this happen many, many times. Folks try to raise the trunk by lifting on the trunk frame, rather than the trunk lid itself. Make sure that the lock button engages, then lift only the lid.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles