MacBook Pro 17" Mid-2009 works fine but has trouble starting up

[david04]

I have a Mid-2009 MacBook Pro 17" that works great. But when I turn it on or resume it from sleep, it shuts down immediately.

I press the power button, it turns on and shows the apple logo - then shuts down like someone pulled the power. I do this about 4 or 5 times before it actually fully turns on.

Sometimes a PRAM reset helps it in the second try, but I don't want to do this every single time I boot up.

Any ideas?

 

[boast]

have you done the usual disk repair? http://support.apple.com/en-us/HT203176

or the apple diagnostics? http://support.apple.com/en-us/HT202731

 

[david04]

have you done the usual disk repair? http://support.apple.com/en-us/HT203176

or the apple diagnostics? http://support.apple.com/en-us/HT202731

I did the disk repair and apple diagnostics passed.

After it gets into OSX, its perfect with no problems. But when I sleep it or shut down, it won't turn on again. Even going SMC,PRAM resets doesn't turn it on all the time.

Has anyone experienced this?