I bought a SONY Z-series-- in November. In January, the screen showed a line in it. I called in January 3rd for service support. It is now March 3rd. The screen still has a line on it. The date is March 3rd. An onsite technician has NOT been called out even though the part has been in since Feb 9. I've called into Sony multiple times without any result. Please advise on how to handle this matter as I have had a defective computer for 1/2 the life that I have owned it. read full review »