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I have a Toshiba A300-444 core duo.  When I turn it on, Windows 7 starts to make a hard shutdown but sometimes work normally. Now the problem is more persistent. I cleaned the heat sink, make the memory and hd tests, and change the AC adapter but make the same problem.

Rajaa C
2014-06-20 02:06:37
Run a sfc /scannow. Here's How:Open Command Prompt as an administrator, often referred to as an "elevated" Command Prompt.Important: For the sfc /scannow command to work properly, it must be executed from an elevated Command Prompt window in Windows 8, Windows 7 and Windows Vista. This is not required in previous versions of Windows.Once Command Prompt is open, type the following command and then press Enter.Sfc /scannowNote: There's a space between sfc and /scannow.Important: If you're trying to use System File Checker from the Command Prompt available from Advanced Startup Options or System Recovery Options, see Tip #1 at the bottom of the page for some changes in how you execute sfc /scannow.System File Checker will now verify the integrity of every protected operating system file on your computer.This process to check maybe time consuming, but is worth it.
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Nuno.goncalves.it
2014-06-19 18:47:36
error voltage disk but i change the hd and problem persist i see the logs behavior
Hovsep A
2014-06-19 18:42:20
is it the same when you boot from live cd, like hirens boot cd, ubuntu boot cd.
Hovsep A
2014-06-20 06:20:05
try to see your hard disk health, any warningshttp://www.hdsentinel.com/
Bruce E
2014-06-19 18:27:09
Open the Event Viewer and look for Warnings and Errors in the System log.