The monitor and keyboard on my 4 year old Toshiba Qosmio X75 Laptop would not turn on. Here are a few things that I tried... 1. Press the F4 button (or FN+F4 keys simultaneously) to switch to external monitor and then again to switch back to the laptop monitor. 2. Press the Window key and the P key simultaneously, as per the manual's troubleshooting suggestion. 3. Unplug the power cord, remove the battery, plug in the power cord, press and hold the SHIFT/F8/Power buttons simultaneously (a quick press during the first attempt and then I held them for over a minute on the second attempt). 4. Press and hold the power button for more than a minute. 5. Remove the cover on the bottom of the laptop, remove the RAM memory cards, and put them back in to make sure they are seated properly. This one fixed the problem... 6. Replace the CMOS battery (a CR2032 coin cell lithium battery). After four years of use, the old one was completely dead. Hope this helps!