Satellite L850D does not boot up - black screen

ok.. my wifes L850D was having problems with black screening on boot up after the toshiba screen.
I ran a few different utilities including a reset.... this all started about 3 weeks after the win 8.1 upgrade.
Rang tech support who nicely informed me that because we put 8.1 on it it voided the warrenty. (nice guys btw)
So refused to help.
So went and reloaded Win 8 from my DeII, just to see if it was a problem with hardware of software.
(yes i know but it was to be only temp).
It booted fine, sat there for ages without a problem.
It wasnt until i downloaded the toshiba drivers, (yes the right ones) did a reboot and hey presto; black screen again.
That would kinda imply its a problem with the toshiba drivers?
Ok so the wife decided screw it, put Win 7 on it.
Rebooted with the disk in. sat and sat. google finally informed me i had to disable secureboot, and put uefi to csm.
Ok fine, went into the bios, disabled secure boot, changed uefi to csm and reboot.
Now i get nothing; screen wont come on at all, fan starts, cd rom kicks over and nothing, shuts down instantly if i push the power button.
I've pulled the battery out, external and internal, let it sit for a half hour and still the same thing.
Any ideas???

The whole story is for me a bit confused so let me start from the beginning with some basic stuff.
In your posting you didnt write which model do you have exactly (L850D-xxx) and I cannot check notebook specification but I presume this notebook was delivered with preinstalled OS, probably Win8.
Notebook with factory settings has preinstalled OS that includes all necessary drivers, tools and utilities. One of them is Toshiba recovery media creator. Using this tool you can create recovery media (DVD or USB) and use it to reinstall original OS if there s some problem and HDD recovery doesn't work.
Best option now would be to use such media and install original recovery image. Have you created this recovery media?
Generally speaking when you by new notebook you are not obliged to use original OS. You can install whatever you want and it has nothing with warranty. You can install any OS, especially all supported operating systems. So I don't understand how you could get such info from technical support.
Anyway, try please to connect your notebook to AC power supply and start notebook again. What happen exactly? Can you see Toshiba welcome screen? Try to press F12 several times. Any reaction there?

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/private/var/run/StartupItems
/Library/StartupItems
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/System/Library/LaunchDaemons
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Satellite L850D does not boot up - black screen

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