The 7 beep has an easy fix. It the same way you fix the red ring of death on an Xbox 360. Block /stop fan from spinning. Then Turn it on and Wrap it in a blanket. Now let it over heat I'd say about 10 minutes. Unwrap it, unblock the fan hit the power once to turn it off and once to turn it on. I'm about 90% sure your Dell just fired up like it never had a problem. Now this is not permanent as long as it's on it will continue to function great. But if you turn it off some times even for a second, you'll have to repeat the procedure to get it to start again. But hey it still better than not functioning at all.