Thinkpad E40 notebook black screen and other brand notebook black screen is not very different, basically are the following seven reasons.

1, display data line contact bad;

2, bad graphics card or display problems;

3, poor CPU contact and overheating;

4, poor memory contact;

5, poor power performance;

6, the machine is infected with CIH virus, BIOS is destructively refreshed;

7, Microsoft's black screen, please patch.

How to fix it?

       1, the boot screen black screen, only the indicator light, the host did not reflect. Behind the host stretched the host, it felt that the fan was turning. No voltage is measured at each channel. Remove the power supply adjustment tube and find it normal.

       2. Power on alarm, it should be memory failure. Unplug the memory, clear the finger, and insert it normally.

       3, boot power and CPU fan are normal, but the screen without any reflection, and no self-test sound. This machine uses SLOT1 structure, CPU easy to contact badly, reinstall normal.

       4, the power-on self test is normal, but the screen is not bright. According to the owner's introduction, pull the rear display signal line. Take a look, a pin is bent.

       5, the boot screen does not shine. The machine does not self-test. Shorten the boot terminal on the motherboard with the hands and start normally. It turned out that the start switch on the panel was broken.

       6, boot does not self-test, check the power is normal. With the minimum system method, the machine can start normally when the optical drive is unplugged. The fault is reproduced again. Description A problem with the optical drive caused the machine to fail to start.

       7, there is a situation that the computer LCD screen is broken, then we need to buy a screen suitable for their own notebook model to install up

       I believe that the above-mentioned method can better help you