After leaving the laptop to rest for a while, I managed to get it to boot up only to have it shut down after a few minutes. I did notice though that the fans were running at full speed, even when it wasn't doing anything. The laptop wasn't getting hot but the fans just seemed to go at full speed constantly until it shut down...
I have been in touch with the service provider and i've been told to bring it back in on Monday and they'll switch the logic board again and make sure it's running properly, so hopefully that will fix it.
I'll let you know the outcome
Thanks alot!