What does Dell say this will cost to fix? If more than a new laptop, then its the end.
You ask if it's one part or the other. Here's the deal. In the shop we use spares to swap one then the other. Home repairs are brutal since the usual DIY repair person won't have the spares.
replaced 15.4 " lcd a few months ago. Also, inverter. Closed lid one night, cnfg'd to "do nothing" on lid closure. Next day, I opened lid and screen started flashing solid colors. Tried restart and no difference. I can plug in external monitor and turn on by key FN-F8 and external works while lcd still flashes solid colors. Is there a way I can tell if video card is bad or is it the motherboard ?