When you turn on the computer, the display hangs . To solve this problem, follow these steps: Step 1: Turn off the power of the computer and carefully unplug the data cable and power cables connected to the hard disk , CDROM or DVD on one side of the casing and restart the computer by connecting them properly See. If the problem persists then go to the second step. Step 2: Check each RAM processor, power supply connection separately from the motherboard. Is there any problem or loose connection at the cable connection ? If you still have the same problem then go to the third step. Step 3: Connect the motherboard to another good computer to check if the motherboard is OK. If not, the motherboard needs to be replaced. It is better to do the work with someone experienced in the service center