Satellite Pro A300 shuts down

Hello.
I have had my A300-1l4 laptop for 5 years, performed maintenance on it several times and I'm stumped.
What happens is that it started randomly shutting down several times a few weeks ago. It wasn't so annoying then because after the 3rd try, I was able to actually use the laptop for hours on end.
The problem got worse, though. It started shutting down more and more often until it just stopped being usable at all. Windows would load, but it'd either freeze or just shut down a couple of minutes after booting.
Naturally, my first thought was either energy or HDD, so I tried leaving it in BIOS for hours to see if it'd shut down (it didn't), and removing the battery, using the cable and so on. It's not energy. Took out the HDD and diagnosed it. Works perfectly.
Another strange thing, it's not reading DVDs. BIOS still acknowledges the drive, but it won't boot from DVD.
I tried booting from a bootable exHDD, and it does boot. Alas, whenever I try to install, I can never do it, since it shuts off a couple of minutes in.
Also, it cannot be heating. Cleaned it, applied thermal paste but the problem persists, and it doesn't overheat.
Another peculiar thing is that it was taking far less time for the laptop to shutdown while both cores in the processor were active than it took after I disabled multi-core processing.
Now, I'm only asking here because I ran out of options. It seems to me, as a technician, that it's likelly the motherboard, but I wanted some more input on probable causes.
Thank you, and sorry for my poor English.

On this virtual way it is not easy to say what the problem is. as I can see you are technician and you know what are you doing.
My first thought was overheating but as I can read you have already checked this option.
What you can try is follow: start your notebook and enter BIOS settings. Leave it on this stage. It will be interesting if notebook will switch off again.
When notebook switch off what happen with DC-in, power and battery LEDs? Have you noticed some power cut-off?

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[Edited by: admin]

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Message was edited by: Machia

> {quote:title=MisterX wrote:}{quote}
> > EDIT: Ok, the problem persists only when the LAN cable is joined.
> Go to the BIOS, set it to default and then disable the “Wake up on LAN” option.
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>
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*@cfrigerio:*
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Satellite Pro A300 shuts down

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