It would appear so...
1st Ram slot works fine ?
2nd Ram Slot if populated = Black screen
If only the 2nd Ram slot used does it still = Black screen ?
Black screen is occurring due to the Video card trying to access the ram (as most laptops use Ram for Video, unless dedicated gfx card is specified)
Test 1 - Try each ram in Primary slot to test Ram stick is ok
Test 2 - Try each ram in only in 2nd suspected faulty slot - to fully test ram slot
This way to confirm All Ram works ok in working slot... and 2nd slot is faulty.
This also tests compatibility of Ram with each other if 2nd slot works, but ram together black screens
1) Return Laptop if under Warranty for Repair/Replacement (back up your files)
2) Ask Vendor where you got your new Ram stick for a bigger Ram stick since your laptop now only supports 1 Ram chip