MINI won't start.. Please help
 

First time posting here.... But I've been lurking, reading and learning since I got my 2009 mini in may of last year.

I've had a couple problems with it... In June of last year my timing chain tensioner backed out and dumped ALL my oil. Luckily I saw the oil leaking and had it on the way to the shop... They replaced the gasket and refilled the oil. Since it was under warranty I drove it the 150 miles to the nearest mini dealer and had them give it the look over and they said it was great... The local shop did a great job.

Fast forward to December of last year... I was reaching 50k so I wanted the dealer to again give it a look over before the warranty was up... They ended up replacing the tensioner and sent me on my way...

Fast forward to last week... I drove my car Friday out to dinner then home... No issues. Saturday I checked my oil levels... They were fine (oil a bit dark... But levels good). Moved the car out of the garage then back in... No problems. Hopped in the car Sunday evening n nothing... Wouldn't start.

When I put the key in the radio comes on... The door ding goes off.... Lights come on. When I push start the engine turns over. Sounds like it almost starts but doesn't. Tried again Monday... Same thing..

I don't know what to do... To top it all off the Tuesday before this I hit the 50k mark. Being a single mother ill admit I'm not super handy under the hood or bonnet.... But that being said I also don't want to get taken at the garage. Any help would be wonderful.