Hello, I got a DELL E153FP LCD display brand new a year ago which has been working fine until lately after I turned it off and unplugged it to add a memory module in my computer. When I reconnected and turned power on, the screen lit up for 3 seconds and turned black. I repeated powered on and off for dozen times but failed to keep it stayed display. When I removed the VGA cable from my video card and turned it back on I see the floating Self Test Feature Check Box on black background displayed for 3 seconds and black out. When I turned power off and turned power on it lighted up for about 3 seconds and back to black screen again while the power light stayed green. I tried to perform the factory reset but it still has that problem. I changed the power cord and then the VGA cable but it still did not work. Anyone has any idea? Please help. I greatly appreciate your suggestion.