After 20 1 1 year, it was sent two or three times because of the motherboard (I don't know why).

The specific performance is as follows: five brand-new hard disks (MHDD test is normal) produced a lot of bad tracks after being used for about 30 days without replacing anything, and finally the problem of replacing the motherboard disappeared. Another customer changed hardware (power supply and power cord, memory, CPU, UPS, graphics card, chassis (including front switch and USB interface) every time a hard disk broke, or three hard disks appeared, and finally a lot of red blocks were used.