Elegoo Mars (2?) Not printing at all

Hi all - first time poster. I've had my Elegoo Mars for about a year and a half - it has been great, recently I had a number of bad misprints, now it looks like it's not even trying.

I have re-levelled, cleaned, even reinstalled the firmware.

All I get is usually some junk at the edge of the baseplate - nowhere near where the print was placed (see picture below). As it is printing, the screen shows the slice layers as normal, and it does this with models that I already have the .goo files for that have printed well before.

Any ideas? My only next idea is that maybe the UV light is faulty? Any help appreciated.

Thanks

Gavin

https://preview.redd.it/d3fk6d9t4bah1.jpg?width=480&format=pjpg&auto=webp&s=0a8501adeb2b6ae9208ac21a7058360e4d8d3284

https://preview.redd.it/nqwzngcu4bah1.jpg?width=640&format=pjpg&auto=webp&s=7931a6bc733e9467e4df17ffac01735f6f0937e1

https://preview.redd.it/mkdu56nr4bah1.jpg?width=481&format=pjpg&auto=webp&s=da64b363bbe3620078ed1c309db6f51e14dc7a4a