OSX partition won't boot


hello.

have problem concerning macbook pro 17" (early 2009) running yosemite.

story:
running until yesterday.
wanted reboot system, however, during start-up, progress bar under apple logo goes half-way (very slowly), after turns prohibitory sign.

have windows 7 bootcamp partition well, which starts fine.
within bootcamp, can acces osx partition well, don't think there hdd problem (however, correct me if i'm wrong)

have researched internet hours , hours couldn't find working solution of yet.

have tried far @ startup:
- pram reset (multiple times) > does not make difference.
- command + r (recovery mode) > does not start. apple logo > prohibitory sign again.
- option (startup manager) > osx(obviously not working) , bootcamp(working) partition showing
- n (netboot) > shows picture of globe blinking few times , disappears. after, same before (apple logo > prohibitory sign)
- shift (safeboot) > doesn't work, safeboot not start
- command + v (verbose mode) > shows usual white text, gets stuck on "still waiting root device"
- command + s (single user mode) > same verbose mode

worthy note not have access installation dvd have purchased mbp second-hand , disc not provided.
also, did not install while using osx yesterday (when still running).

ideas?

thanks.
 

you need access installer disk/usb stick boot machine sits toast. no recovery or single user mode available have no way repair problem. have backup of data if/when installer disk disk utility not work repairing/verifying drive in machine fresh install in future.
 


Forums Macs macOS OS X Yosemite (10.10)


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