Mac book starts to boot, then turns off

I have Mac Book Pro (13", Yr2011) which will not boot. It has a 1TB HD which has been partitioned for Mt Lion (primary) and Snow Leopard. The computer has worked fine in this configuration. For about 6 wks, the computer was not used and apparently the battery charge depleted to zero. When an attempt was made to use the computer with battery only, the screen was just light gray with a circular wait icon. After several minutes with no change, the battery was noted to be discharged. A charger was connected, but there was no change in the screen. The computer was then turned off and left to fully charge. On first attempt to turn on, the computer did come to life. However, when attempting to Update software, it displayed No Internect connection - even though it was connected by ethernet. The computer was power cycled, however the screen then again only showed light gray with wait icon. Now when attempting to boot, the screen shows light gray, circular wait icon & horizontal bar graph indicating something is loading. After about several minutes, the bar graph fills & disappears, however, the screen remains light gray with wait icon - indefinitely. On a few attempts, the computer and screen simply turned off after about 30secs.
If I hold the Option key while powering on, then the Mac does boot ok to Snow Leopard. Apparently, the Mt Lion side of the HD was corrupted during the low battery boot appempt. The last time I backup MtLion was several months ago, so if I prefer not to reformat and reload from scratch.
Since the Mac did boot up once, I'm wondering if there is a way to recover without having to reformat and start again.
Don

Tough without the Install disc, but some things to try...
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).

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Mac book starts to boot, then turns off

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