System Board Failure Symptoms
When a system board fails, you may experience the following most common problems with your laptop.
1. The laptop is completely dead. There are no LED light activity when you press on the power button or plug in a known good AC power adapter.
2. The laptop starts but the video output on the LCD screen or external monitor is garbled. Most likely this is related to the VGA chip failure.
3. The laptop turns on without video on the screen and the power LED starts flashing.
4. The laptop works fine with AC power adapter but will not charge a known good battery. If that’s the case, most likely there is something wrong with the battery charging circuit or DC power jack.