Mac book pro  stops  during startup?

My  Second hand  Mac book pro  insists on shutting  down before  a fullstart up. Ihave tried  booting  from Disk warrior  but shut  downs happens  before a full start up.
Battery  is  fully charged ..green indicator. However if  hold the C  key  without a cd  it  manages to  fully boot up  with a cd ( diskwarrior ) sitting in the drive.
I am just now  trying to  run Permissions repair using disk utility  before it shuts  down.
In the meantime .. any ideas?
J

Hold c booting off the disk suggests the machine is working and perhaps the hard drive isn't due to software or hardware issues.
Your next step is to determine if the hard drive is accessible or not.
For Snow Leopard 10.6, you should have gotten a disk(s) most likely grey, from the previous owner. Hold c boot off the first one and see if with Disk Utility the internal drive appears on the left side. If not the drive is dead and needs to be replaced. If the replaced drive fails to work it's a cable or logicboard issue.
For Lion you hold command r and try booting into Lion Recovery Partition on the internal hard drive, obviously if this works the drive is working, but the OS X Lion Partition is not booting.
You can choose to use  Disk Utility to erase the Lion OS X partition (with Zero Data option) and use your AppleID to download another copy of Lion from Apple's Servers, then reboot normally and you'll have a brand new machine all ready for setup.
https://discussions.apple.com/message/16276201#16276201

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