My Mac book pro (2011) start-up goes straight to disk utlities and wont install mavricks.

Question

Hello,
     My mac boook pro 2011 wont start up to my internal harddrive. it will sit on the white screen for a bit before it takes me directly to the choose language then disk utlity and shows the;
Time machine
install osx
get help online
disk utlity
     Ok so my harddrive is partitoned into two, but everytime i try to delete the partition drive, it wont let me. says (Macintosh HD2 cannot unmount please try again). And everytime i try to earse the free space, it wont do it as well. but its says it did.
     Then i try to repair my disk but my verify/repair disc permissions is not choosable but the veriy/repair ARE choosable. i choose verify/repair option and it says everything is fine. but it still wont let me choose verify/repair disk permission. My Saftey Mode is not working ( circle with line through) so i cant fix that problem. I also done the reset PRAM/NVRAM and SMC and still nothing.
     Ok the problem goes further. my Mac book pro came installed with Snow Lepord not mavricks but it wants to install mavricks instead. I put my internet into some single thing and it switched it to Lion instead of mavricks. but that isnt the problem (just thought it was weird how it switched OSX system like that) the problem is that it doesnt want to download install any OSX system. First it didnt let me get pass the choose install drive wondow. , then i switched my date in the terminal and was able to sign in but it wont download any OSX system, it would say (Something came up, please try again). My install cd wont work, keeps spitting it out. And trying to do an OSX system download wont work through this browser on disk utltity (not enough space on the drive).
     I was deleting log files from my mac through the partitioned drive and i accidently deleted a system folder that had logs. i was wondering if this was the problem and if its making my HD fail ir is my HD done? and can i put Yosemite on a usb and boot it that way or burning it to a CD and doing a cd install?
     Please i need help becuase i use my mac for film and editing and my mac wont boot to the desktop, just to this window. ill try to post picutres of what happens.

Answer 1

That you are getting the BONG is a good sign, it's unlikely to be hardware if you are able to hear that.
Start by running SW update. It's not that there is a specific fix, but when updating it may rewrite some system files which may get this going again purely as a side affect. Worth a go, and should not harm the system.
Try reset the PRAM - Resetting your Mac's PRAM and NVRAM
Hopefully one of these quick fixes works, otherwise we'll need to try isolate the issue next - so if still having a problem, I'd try create a new user and login as that user to see if the issue persists (which will tell us if it's system wide or user specific)