Is it unusual for a motherboard and/or video card to go on a 3 month old computer?

Tech support wants to send technican to house (7 to 10 business days) to repair computer. Why would the motherboard/or video card go so soon? Should I just return it now and save me more breakdowns later? I replaced the 17 inch lcd monitor with a 19 inch monitor. Could this have done something? Thanks (Should it take this long to repair?)|||Monitor size will have nothing to do with your problem. You have obviously just gotten a bad computer. I would take it back and get an exchange if possible. It could be a power supply issue (surge). If not...make sure the computer is working properly before technician leaves.|||yes it is unusual. but in any manufacturing process some units do have factory defects. way back the dos era, early 80's, every computer undergoes a burn in process for at least 24 hours before sending to the costumer. but nowadays they just plug in everything sometimes not even checking if it actually works or not. your monitor has no connection to the problem. if i were you, i would ask for a replacement unit if covered by the warranty coz it will give you more headache later on.