I received what appears to be a defective unit. I've had this laptop for about 10 months now. Every several months the laptop can't be powered on. I've had to send it in for repairs 3 times for the same symptom.  Each time they "fixed" it, it only worked temporarily. I was hoping they found and fixed the root cause by the second time this happened.  By the third time this happened within a year, I'm now worried this is a trend and Acer won't replace the laptop unless the repair center advises it. When my warranty is up in a couple months, I'll have to pay full price for repairs if the trend continues. If I can't get a replacement unit, I basically wasted $1000.  Lesson learned: If the laptop needs to be sent in for repairs within the Amazon return policy, IMMEDIATELY return or exchange it, don't assume that the Acer repair center permanently fixed the issue. I've voiced my concerns to Acer support, but they won't replace the unit unless the repair center advises that they can't repair it anymore. If the repair center keeps temporarily fixing the unit, then the cycle just continues, and I lose time, money, and productivity.