Do your own work. Notebook Display fault __dell

The Dell Inspiron 9300 I bought in November 2005 had this problem, normal boot, black screen after XP progress bar ended. The external CRT, DVI, S-video interface can be displayed and started normally. On an external monitor, enter the control panel of the X300 video card in the display properties, and the notebook panel is displayed as disconnected. VGA mode and Safe mode can all go into XP. The LCD panel can be detected in the BIOS and the detected resolution is normal. Take apart the casing, unplug the screen, connect the external monitor, and then boot into the BIOS, then the LCD screen is not detected. Suspect the video card is out of the question. Call 8008582968 to Dell after the after-sale technical support, said my machine only one year warranty, now can only pay for maintenance. Dell Engineer I suspect there are problems with the motherboard, video card, and display.
Lenovo to the desktop graphics card sometimes because the gold fingers oxidized or sticky dust, resulting in poor contact, then the treatment is to rub the gold repeatedly with the eraser fingers, so that the light, and then plug the basic can solve the problem. But for a notebook video card. You can't use an eraser. It is best to use a brand new paper or water sandpaper, paper money is not easy to drop crumbs, and the surface has a certain degree of roughness, repeated grinding effect is better. My dell9300 notebook, that's how it's saved.
Fold the paper bill into layers to rub the interface between the video card and the motherboard. Be sure to pay attention to anti-static, especially in the winter, dry air, wear more clothes, perhaps a bow on the body will have tens of thousands of volts of high pressure.