Purchased this PC 10 months ago.  The PC would shut down for no reasons; only software used is Microsoft Office, nothing intensive.  Contacted the seller regarding issues.  Per tech support, if there is issue with the motherboard, the PC will need to be ship back to China with estimated repairs taking 2-3 months.  If it is not related to motherboard, the manufacture will reimburse for the parts.  This is the first time purchasing non-dell PC; never again.