A new screen and cable later and neither seem to have fixed the problem. The laptop runs perfectly except via the LCD cable. I have removed the new screen but the new LCD cable is still in place. No power adapter is included.
HP 250 G8 15.6" Laptop | Intel Core i3 | 16GB RAM | No SSD | Multiple Conditions
HP 250 G8 Notebook, Intel i5-1135G7, 8GB DDR4, 256GB SSD, Win11, 15.6" Laptop
HP 250 G8, i5-1035G1, 8GB DDR4, 256GB SSD, Win 11, 15.6", Laptop
HP 250 G8 Laptop 15.6" Quad i5-1035G1 8GB RAM 256GB NVMe WIFI Windows 10 HP3
CHEAP HP 250 G8 i5 gen 10 16GB 240GB SSD 15.6". Windows 11
HP 250 G8...FOR PARTS OR NOT WORKING