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Confirm if the hard drive is connected properly and if it is recognized in the BIOS

Confirm if the first boot entry in BIOS is the hard drive

Confirm if there is physical damage to the hard drive

Confirm if the operating system is installed properly on the hard drive and if the system is installed on the motherboard used

Confirm if the network card hardware is recognized in the system and if the driver installation is correct

Confirm if the network icon in the lower right corner of the system desktop shows a connection

Confirm if the IP address obtained in the system is correct

Confirm if it is possible to ping the LAN connection

Confirm if the graphics card driver is installed correctly and if two displays are recognized under the system (set to single display)

Confirm if it is set to the optimal resolution of the monitor.

Check if the connection cable of the monitor is loose, try replacing the connection cable or try replacing the memory for the display screen

Confirm if the wire definition matches the motherboard (with built-in pins)

Replace the cable (poor VGA cable quality causes the monitor to not display high resolution and incorrect monitor color)

Digging money failed, the belt and rubber wheel of the cash collection department are aging. Replace the cash collection department and conduct a cash test; Irregular stacking of banknotes, recycle the entire stack and check if there are any issues with the stacking section. If the fragments are usually broken, replace them with a new stacking section