VAIO Laptop suddenly turns off itself

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Hello Gurus...
After reinstalling windows 7, i updated few drivers from:
https://www.sony.com/electronics/support

they were of webcam, sound and graphics.. all went well...

then i pissed my laptop off when, in the same list i saw
"BIOS Update Utility", to version R0300Y8 (previously, it was R0200Y8), downloaded and installed it,. :( :'((((

it restarted to complete the update,, now my laptop has been turning off after few seconds., (like during its boot, as soon as it reaches wallpaper screen, bios screen, when booted through WIn7 DVD)...

i desperately need your replies with solutions ...
your responses will be highly appreciated... ive already invested alot on it...
Related:

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Can you open in safe mode and roll back the drivers you updated?
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thanks for the reply Sire...
no, it turns off as soon as it boots in safe mode., like it happens in a normal boot.
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Ok ... is it possible to downgrade your BIOS to the old one? Im sure many PC providers provide a program to install BIOS from outside Windows - perhaps off an external hard drive or dvd

What is the make and model of your system?
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Ah - a little researc and I found what may be a solution - perhaps the new BIOS changed the boot settings. Try this ...

First goto BIOS setup
Change the boot mode UEFI to Leaacy (or the other way round. Make a note of the initial setting so you can return to it if this fails.
Now try rebooting.

I hope this works for you.
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Thanks, My Model is Sony Vaio, E Series VPCEB26GM. I wish it couldve helped, But your prescribed boot mode option isnt there in my BIOS :(
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Moreover, my machine shuts down if it takes sometime on bios even...
So i guess if I managed to find some downgrading technique through external HDD or flash drive, I won't be able to get to it. Because laptop would have shut Down...
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Ok - my last idea ...

As this is a new installation of Windows 7 I guess that you have no programs installed or data to lose. You could try reinstalling Windows 7 and thereby bypassing whatever problem is happening with your machine.

If you have data that you want to save, then if you have a spare hard drive then you could swap the drives, install windows on the spare, roll back the BIOS, and reinstall your old drive, but this is long winded.

I also feel that the BIOS is in fact working. The purpose of BIOS is to boot your computer to a point where an operating system can take over. This is happening as Windows does load, even though the machine turns off after a few seconds.

This is usually my last resort, so hopefully this will work.

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