Well, it flashed for about a month,(Dell M5030, Win-7-sp1, Home Premium), then I got tired of it, So.. took out some software I was playing with, and no, it still flashed. flashing about 60 times per minute, and yet the computer didn't have any problems at all, worked like it always has. Did all I could think of (scans, regedit, files), and was about to do a recovery, when I noticed the little icon on the tool bar, 'ACTION CENTER', so I went into the action center and it says you have 'one' issue to resolve..Run- BACK-UP-, which I haven't done in several months.. So that's what I did, and backed it up on an external HDD, without any problems. Guess what, the light STOPPED blinking 60 times a minute, and now the HDD light is quiet and only works when it's suppose too.. NOW.. the QUESTION is.. Why would this cause the problem.. I have no idea, I'm not a computer technician. Maybe you can resolve this question, thanks for your time, and expertise.............