I've had nothing but issues with this computer. I purchased DELL Optiplex 990 SFF Flagship Premium Business Desktop Computer from MST Memory Solution Inc.I purchased it in April 2021, and thought it was such a great deal. When I received it, the tower wouldn't set-up properly because it said it didn't have a hard drive. I e-mailed customer service, and they told me I should try installing a new hard drive. I'm familiar with computers, but not that much. After a few messages back and forth, they let me return it back to them and have them install a "new" hard drive. This computer was slow, but still workable and better than the Windows 7 computer we were replacing it with. Fast forward to September, and it is so slow and basically unusable. It keeps disconnecting and going into a "blue screen" mode. It constantly restarts itself, even during use. I e-mailed support and they won't let me return/exchange it because it's beyond the 90 day warranty. They offered to fix it, but I'd have to ship it to them and still pay for the computer parts. I'm sure that will cost more than I paid for the unit.Don't buy it.