Display/Resolution problem after screen replacement

Hello there,

Thanks for your time in reading my post.

I've replaced a cracked screen on a laptop with a like for like replacement from a seller on eBay.

I fitted the screen, powered on the laptop and it's instead displaying what it should be 4 times above and below each display. It's almost as though the screen doesn't support the resolution or refresh rate.

Now I don't understand why this is when it's a like for like replacement and the real strange thing is the first time I tested it when it showed the HP BIOS Start up screen it WASN'T displaying properly... but when Windows loaded it did display properly.

The problem I've now got is Windows won't load and I can only boot in to safe mode (this was already a problem before, Windows sometimes wouldn't boot). In Safe mode the screen doesn't display properly.

Please help!!