Macbook pro 2009(unibody) shut down by it self and turn on 30 min later ..

hi i bought a macbook pro mid 2009 (unibody), i change the battery about 4 monts ago (done by montréal apple store) and last week, it start shut down by it self suddenly and dont turn on for half an hour! then, it start like if nothing appen but do it again 20 min later. i checked the fan, it's working properly, no over heat, no water damage, i try to reset the "smc" does'nt seem to have change anything . before a change the battery about 4 month ago, it was doing the same thing but less often and when it was crashing, i had to wait a week sometime two before it was turning on again ! it completly stop when i pay to change the battery ! coul'd it be a bad battery ? im alway's carefull fully discharge the battery before put it on the charge ...

You really shouldn't allow the battery to fully discharge before hooking it up to mains - that does nothing but cause damage to your battery.
If you said that the unit was heating up too much, I would put it down to a thermal shutdown (although you can generally recover from those in 30 minutes or less). As it is, it's difficult to give you a diagnosis over the Internet - if I were you I would take the machine back to the Apple Store and let them run tests on the machine. I think that's the only way you're really going to find the root cause of your problems.
Good luck - let us know what the techs have to say...
Clinton

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The advice depends upon which OS you are running. Well the advice is the same the procedure is different.

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Model Identifier:          MacBookPro5,5
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.53 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          3 MB
Memory:          4 GB
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There's really no telling what's exactly wrong with your machine without having the diagnostic tools to check it out - which Apple techs at Apple Stores and AASPs have. So my advic eis to get it diagnosed and get an estimate for repair.
There are just some things that need 'hands on' diagnostics that are impossible to do over the Internet.
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Here are the specs of my machine:
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4 GB Ram/320 GB HD
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Macbook pro 2009(unibody) shut down by it self and turn on 30 min later ..

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