Laptop Will Shut Down and Reboot

I have a Toshiba A305-S6872 I replaced the hard drive about a year ago, Have a new Power Adapter, I use a cooling pad The Laptop just started to Reboot itself or just turn off. Is there any PC health Check to do what's causing this? I see several posts for people with Laptops that have the same problem but no replies from Toshiba, How can you tell if its a hardware or Software problem. Thank You
Solved!
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Thank you all I tried everything even new hard drive, new ac adapter here while doing a google search someone said they had the same problem the laptop reboots and also the touchpad would freeze. The Solution was go under Device Manager then under Processors if it shows 2 of the same which mine showed 2 Intel Core Duo CPU T5800, they said the second one click disable and restart. I did this and No more Reboot and No more Freezing with the touchpad. Thats all it took laptop works fine now. If anyone else has the same problem with the Satellite they might want to try this. Thank you all for the replies sorry it took so long to get back I was out of commision with spine surgery. Thanks again all
Here is the post that I got the solution from
Dear Friend,
I had this similar issue & had tried all the steps as mentioned below.
One thing was notices that the laptop would work perfectly fine in SAFE MODE.
Which had the doubts in mind cleared that there is no hardware issue on the laptop.
Tried the following steps & it worked. Even the laptop processing power reduced slightly but laptop works without any more reboots, freeze & all.
Boot the system in SAFE MODE.
go into control panel - system & device manager
there you would find processors.
Of the two processors click on the second processor & disable the same. & after applying restart the laptop as usual.
Voila laptop works perfectly fine at all conditions. Even the power the supply is plugged in which wasn't before doing the above step.
Try Out & Do let know..

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Jun 20 18:42:07 jerome ntpd[136]: time reset -1.165220 s
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Jun 20 18:45:29 jerome SystemStarter[3642]: authentication service (3677) did not complete successfully
Jun 20 18:45:30 jerome SystemStarter[3642]: IP Failover (3685) did not complete successfully
Jun 21 04:00:02 localhost kernel[0]: standard timeslicing quantum is 10000 us
Jun 21 04:00:02 localhost kernel[0]: vmpagebootstrap: 252054 free pages
Jun 21 04:00:02 localhost kernel[0]: migtable_maxdispl = 70
Jun 21 04:00:02 localhost kernel[0]: 93 prelinked modules
Jun 21 18:38:24 jerome SystemStarter[5371]: IP Failover (5401) did not complete successfully
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Jun 22 04:00:01 localhost kernel[0]: standard timeslicing quantum is 10000 us
Jun 22 04:00:01 localhost kernel[0]: vmpagebootstrap: 252054 free pages
Jun 22 19:25:47 jerome SystemStarter[5645]: IP Failover (5675) did not complete successfully
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Jun 23 04:00:01 localhost kernel[0]: standard timeslicing quantum is 10000 us
Jun 23 04:00:01 localhost kernel[0]: vmpagebootstrap: 252054 free pages
Jun 23 04:00:01 localhost kernel[0]: migtable_maxdispl = 70

Laptop Will Shut Down and Reboot

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