System Manufacturer/Model Number Lenovo Thinkpad T400 OS W7 Professional X64 CPU 2.26 ghz Penryn Core2Duo 1066mhz FSB/3mb L2 Cache Memory 4gb Graphics Card Intel X4500HD Sound Card Intel Corporation 82801I (ICH9 Family) HD Audio Controller Monitor(s) Displays 19" External WS Acer 1440X900 Screen Resolution 1440 X 900 WXGA+ w/ LED
Keyboard T61 Chicony KB on my T400 :) Hard Drives 256gb Patriot Torqx SSD
500 gb Seagate 7200rpm Internet Speed Slow DSL Other Info use my T400 for school and plug in the monitor for extracurricular goodness :)
System Manufacturer/Model Number Lenovo Thinkpad T400 OS W7 Professional X64 CPU 2.26 ghz Penryn Core2Duo 1066mhz FSB/3mb L2 Cache Memory 4gb Graphics Card Intel X4500HD Sound Card Intel Corporation 82801I (ICH9 Family) HD Audio Controller Monitor(s) Displays 19" External WS Acer 1440X900 Screen Resolution 1440 X 900 WXGA+ w/ LED
Keyboard T61 Chicony KB on my T400 :) Hard Drives 256gb Patriot Torqx SSD
500 gb Seagate 7200rpm Internet Speed Slow DSL Other Info use my T400 for school and plug in the monitor for extracurricular goodness :)
Can you blank the screen using a different method? If yes, it may be best to leave the "problem" alone until you update your version of 7. Even later pre-RTM versions may correct it. There are numerous candidate causes for this issue.