Mavericks was fine for a while but now it will not start up, any ideas please?

I get a white screen with apple logo, revolving disc and bar. once the bar reaches the end the MacPro switches off. ican do a safe start, the HD appears to be OK so I have tried to re install Mavericks but I get as far as selecting disk , the alternatives are HD and startup but both are locked. There is anEPI disk but that needs journaling via Utilities which does not seem to work. Where am I going wrong? Has anyone else had this problem?
I upgraded from Snow Leopard.
Thanks for that
TA

Thank you I have just tried this and after the attempted repair, I got an error and alert message that Live file system repair is not supported. Tried to repair the HD, volume was repaired, it stopped at Boot with the message: disk Utility can't repair this disk back up files, reformat disk and restore files. I guess this my answer.
Thank you for your help
TheresaAlexandra

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I can see that this issue has been quite extensive, and frustrating, and I am so sorry for all that has happened societygirl! I would like to help you work this issue out. Please follow & send me a Direct Message, so I can get your account specifics and help finally bring this to a resolution.
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I just installed OS X Yosemite on my MacBook. I now cannot get the computer to start up. If I hold down the power button to try and power it back up, it will not start. Any ideas on how to fix this?

I just installed OS X Yosemite on my MacBook. I now cannot get the computer to start up. If I hold down the power button to try and power it back up, it will not start. Any ideas on how to fix this?

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Mavericks was fine for a while but now it will not start up, any ideas please?

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