White Screen while installing Win 7 with boot camp
I am trying to install Win 7 using the Boot Camp assistant on OS X Mavericks on my new iMac 27-inch with 1 TB HD. After deciding on the partition size for Win 7 (I took the default 20 GB) the computer screen turned completely white, without any Apple logo or other indication as to whether the computer was actually running. This has now gone on for more than 12 hours. I tried several times to turn the computer off by pressing the power button, but nothing happened. Now I am wondering if I should just pull the plug and try to restart.
I NEED HELP. Since this is Sunday, it looks like Apple Support is closed as I tried to go online to the Chat Room and there is no response.
iMac, OS X Mavericks (10.9)