Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
My apologies for the wait you have incurred so far. So I can assist you, I need to ask you for some more info.. Lets start with, do you know roughly what year and model of macbook pro you have?
Also, when you say you have tried several methods, could you provide some detail on what steps you have tried so far to resolve the issue.
Thank you for your patience, and response.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.
Thank you for trying the above.. Now lets try the following
Shut the mac down.. Hold down the X key
Start the mac and keep holding the x key.
Lets follow sections two and three on this page
If your Mac doesn't start up and if needed the "If you don't see your startup disk" section.
Keep me posted as to the results, or if you run into any issues.
So holding down the option key when you start doesnt give you any choices?
Nor does holding down command R when you start?
My apologies for the delay.. Ive been working since early this AM and needed to take an extended dinner break.
Let me say this.. All we really need to do is reinstall mac osx.. So.. do you know what version of mac osx is installed on the machine.
10.8 10.9 10.10 or the new 10.11 ?
Unfortunately not.. As whatever OS the machine shipped with could have be easily upgraded once or twice or more in 5-6 years
A safe bet, would be to order a snow leaopard install disk. As the machine can definitely run snow leopard.. And then you can upgrade to mountain lion for 20$, or yosemite for free. ( 10.10 )
You can get the install disk here. http://amzn.to/1Pvfoet
Then all you would have to do is insert the disk.. hold down the C key, start the computer.
And then choose to install mac osx.. the disk does the rest.. This will repair the boot file issues you are having.
Once installed, you can then visit the apple site and pay for a mountain lion upgrade, or go with the free yosemite upgrade. ( yosemite is newer )
If we knew the exact os you had we could just repair your current install.. But theres no sure way of knowing and it could be one of 5 possible os versions, and we dont want to have to buy 5 different disks~
If you have further questions let me know. And when you get the disk, Id be more then happy to help you use it to install Mac osx and get the mac running should you run into any issues.
I strive to provide great service, and greatly appreciate a rating of excellent ( 5 stars ) selected and submitted below this answer or at the top right of the screen. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.