Packard Bell TM99 Laptop, failed screen replacement

Sliepner

TS Rookie
Hi, am prepared to be labelled "thick as mince" however I wonder if anyone can advise how to proceed with the following: Replaced cracked laptop screen on a TM99, on first start up after replacement, the screen worked.....woohoo!, however.....on next startup, there was nothing, no lights, no start up screen...nada. Replaced new with original screen, which although cracked had worked, and it too now failed. Any ideas? The cable for the screen was seated properly and securely, nothing else was moved so am struggling to establish a reason for this non conformance. Could it possibly be a jammed "lid closed" switch? If this is potentially the culprit, anyone know whereabouts it is? Thanks