Portege Z830 - cannot boot from DVD

I have a Portege Z830-11F. I upgraded my machine to Windows 8 and but i didnt like it. So i decided to make a clean setup of Windows 7.
I downloaded the .iso file from internet and burned it to a DVD.
I plugged in my external DVD player, restarted, entered BIOS and changed the boot order and restarted again.
All went well and i was able to install Windows 7.
But i didn't had the drivers, (thought the OS would recognize the LAN driver at least, i was mistaken)
So i upgraded to Windows 8 again (without restarting) just to download the drivers for Windows 7.
I did so, but now i cannot boot from the DVD.
When i enter the boot order section, sometimes the DVD is listed, sometimes not.
In both cases the machine boots to Windows 8 straightly, does not allow me to boot from the DVD.
The strange thing is i was able to boot from the same DVD in the first place.
What can i do to boot from the DVD?

At first I must say that I dont understand why you didnt create recovery media before you have changed anything. Using preinstalled Toshiba recovery media creator you could create recovery USB and the whole situation would be not so complicated. This recovery image is activated but now if you install own OS version you will not be able to use product key that you got with your notebook.
Anyway, now perform complete Win8 shutdown and after doing this start notebook and use F12 to enter boot menu. Of course your external DVD must be connected before you start your notebook. it can be that external drive will be listed on USB boot option like on my U940.

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I can not so good english sorry. I translate the lyrics I write now using Google language tools:).
So it is, bios recognizes my cd / dvd drive already, but before the drive name is an exclamation point in front, for example before it looks like this:
* now *
* Fujitsu HDD *
*! Toshiba DVD ROM *
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before
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I hope I could express myself.
thanks in advance
Notebook Specifications:
Toshiba Satellite L550-136
Windows 7 32bit

Portege Z830 - cannot boot from DVD

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