Dell Studio 1558 (i5 2nd Gen, 4GB, 500Gb, 1Gb Graphic) My laptop screen suddenly shows some small color boxes and goes black but laptop still on. when I restart, screen shows nothing but Hard disk, CPU fan are running normally. than I tried this: 1. Power off the computer. 2. Press and hold the "D" key on the keyboard and then press the power button and wait for the computer to start. . I just heard only loud beep sound continuously, but screen remain black. than I tried this: 1) Unplug the power cord --> Remove the battery --> Hold the power button for 60 seconds --> Connect the power supply then try to switch ON the laptop and It Worked and laptop start normally. but after 2-3 minutes, it happen again screen gone black(it shows small color boxes and go black) than I tried above method once again but this time It's not working.....! Than I connect the laptop to the external monitor and start, It shows nothing on it. First 10 sec monitor run like working mode(green light) then it goes to offline mode(orange light). It's like something is resist in laptop to startup. I don't know what's happening. Please help. Mod note: Please do not spam the boards with posts of the same problem. One time in the appropriate forum is sufficient. Thanks.