I have been using and upgrading computer desktops for over 25 years.I went to add a compatible stick of memory to upgrade and a continuous noise sounded. I immediately removed and replaced old memory. Now machine starts, two beeps, try's to open, then shuts itself off. It repeats this over and over.Acer chat said machine was damaged by me installing memory. That's a new one. Take out module in are going to replace and put the new one in. Simple!Have the machine for 3 months. Agent said warranty voided and advised I take to repair shop!!Thanks a lot Acer!UpdateI emailed Acer and told them the problem.Response stated to mail it to them at my expense. I guess pandemic closed the repair shops they use.In any case they repaired machine.It looks like the “chat” person was misinformed.I will not attempt to upgrade memory and use as a spare machine. I bought a Dell!Crazy!!!!