The computer quit working after 6 months.  I had to contact amazon to get the parts and labor warranty. The seller  repaired the computer and it quit working again after 6 months.  I contacted the seller and they refused to do anything.  It is ridiculous that the computer quit working 2 times after only 6 months.  I purchase refurbished computers for our business all the time and have never had this problem.  Whatever parts you are using are either defective or inferior quality.