I have had my E1505 for about a year. Lately, when plugged in the display is black...I can see a faint picture in the background, but it is not legible. I thought it was a battery issue, but it works when unplugged and just running on the battery power. I also removed the battery and tried to run it solely on A/C power and got the same black screen. Any ideas?? Do I need a new power cord or is there a hard drive issue I should know about?