MacBook Air won’t turn on, freezing, crashing, spinning rainbows

MacBook Air purchased early 2015 won’t turn on,

I get a black screen with the Apple logo and a loading strip which doesn’t load. There is no water damage to the device but the hard drive is full.

Currently need the contents for Uni assessments. Have tried power cycling, SMC? Reset, holding shift, control and alt with the power key, holding command, power and the letters R and P, and holding shift and power which gives me a nearly full loading strip but unfortunately freezes right before success - so frustrating.

I have no tools to open things and I’m hoping to get it repaired before Tuesday (today is Saturday), any ideas welcomed.

TIA MShell