Not heard back from you mutluturk, do you still require assistance or is the issue now resolved, an update would be appreciated.
Hey man I'm sorry for not getting back early, thank you so much for the follow up.
After your last message, I figured I have never installed any software for Intel Graphics. The reason for that, first I didn't know I had to because it was working fine with only nvidia driver, second, this laptop comes Win8, and I downgraded it to Win7 and Toshiba's drivers for this laptop for this operating system is pretty limited, and there was no Intel Graphics driver suggested in the drivers list in Toshiba website (in the Toshiba website link you mentioned here, also there is one more nice website http://www.toshiba.e...ivers/laptops/)I checked Win8 drivers, yes there is a Intel Graphics driver, I downloaded it and it gave this error "This computer doesn't meet the minimum requirements o install this driver software". Ok, I'd to find another one. I went to Intel website, found my CPU model, downloaded the latest driver for intel graphics, error messages kept "This computer doesn't meet the minimum requirements o install this driver software". I figured my Intel graphics is Intel® HD Graphics 4000 and I downloaded its driver for Win7 64bit, but still the same error message. I was this close to fix this. I even downloaded that DDU thing and uninstalled all the graphics drivers in safe mode.
I don't know what caused this problem. There are 2 possibilities, first one is I maybe deleted a registry by CCleaner registry cleanup tool. Second yes I upgraded nvidia driver recently but I'm not sure this happened right after that. Also I have to add for one time I woke up laptop from sleep and there it is, the laptop monitor was working. But next time, it is dead again.
I did a full back up of my system, I am thinking to start uninstalling softwares one by one, I may find a software which causing the problem. I may even install a full new Windows7.
Thanks again for the help. I really appreciate. Regards!
Edited by mutluturk, 10 June 2017 - 04:53 AM.