1. No signal at startup

1. Check whether the external and internal VGA cables are plugged in tightly.

2. If there is no problem with the above, replace the VGA cable.

3. If the new VGA cable does not work, try to replace the driver card.

2. there are snowflakes or interference stripes

1. It is possible that the adapter is abnormal, try to replace it and check if there is interference of high-power electrical appliances near the screen.

2. Check whether the VGA cable of the display itself is damaged.

It should be noted that if you still can't solve the problem by trying various methods, don't disassemble the machine yourself, and contact the professionals to check and repair it in time is the most sensible choice.

3. The display is discolored or lacks color

1. Check whether the external interface of the VGA cable is firmly inserted.

2. Check whether the internal LCD screen connection cable is plugged tightly.

3. If none of the above is ok, try to replace the driver card.