Gpu (or motherboard) heats up and crashes.
First try another gpu.
http://www.overclockers.com/forums/showthread.php/606658-THE-OVEN-TRICK-WORKED
It will temporarily fix the old solderings. Or try to adjust gpu speed lower that it dosent heat up.
"select the USB routing on the mixer and the device on your Computer" so check if you can change it from the audio device settings. what is the mixers model ?
"headset and the mixing board" "headset for monitoring"
so you want to hear the output sound from the mixer ?
so you need to make the mixer route the sound from iTunes to your headphones?
https://social.technet.microsoft.com/Forums/windows/en-US/ca343a3c-c61e-4816-9a96-d973386db2e2/network-shows-as-unauthenticatedchanged-my-network-profile-to-public?forum=w7itpronetworking
you can try looking more from link
try the second memory stick and disconnect all ssd/hdd drives and try open the install dvd... if it still dosent load it could be bad connection whit power cables... and check that gpu is presses all the way down
could be ad block killing the cookies and same time killing the feed. uninstall flash... delete all local content... download the install file... disconnect from internet... disable any antivirus/ad block and install flash
Try disable wireless and try cable. if this works try different wlan drivers. Disable any video acceleration off from nvidia control center. You can also try disable audio hardware and try the videos to limit the problem,
delete the old drivers and try to re-installa http://support.toshiba.com/support/viewContentDetail?contentId=4001975 or Windows driver auto installation program (support Win8) from http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#RTL8188CE
yes and some say the realtek own drivers work best so here is that link http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#RTL8188CE
in toshiba forums there has connection problems specially when using laptop on battery.
This has been helping to get the singal... also some say that using the wlan software helps to find right settings...