Hello Techspot community! I recently reinstalled Windows Vista on my Dell Inspiron 1721 Notebook. During the installation, I completely cleared the C Drive and kept the recovery drive and went on with normal reinstallation. After this, I installed World of Warcraft including the new expansion Wrath of the Lich King. Now, my problem is that when I am playing World of Warcraft, my computer monitor randomly goes black. It wont allow me to hit the power button to put it into sleep mode. It only allows me to hold the power button in and completely shut off and reboot the computer. I am not sure at all what the problem is. To my knowing, I am completely up to date on all of my drivers and such, but I am just not sure what is causing the problem. Any help would be greatly appreciated! Thanks in advance!