A:AnswerThe warranty is 1 year and it is provided by the refurbisher Joy Systems. Here is a link to their warranty information:
https://files.bbystatic.com/hT1sFO81XwDFHigJKpWlVw%3D%3D/3e1580c0-1751-4e1b-ae4c-1de3fa1290ff.pdf
A:AnswerYes you should. Here is the Hardware Reference Guide link:
http://h10032.www1.hp.com/ctg/Manual/c03803181
Page 25 discusses adding expansion cards.
A:AnswerIt has 4 USB ports that are 3.0 (in blue)(2 in the front and 2 in the back and 6 USB ports that are 2.0 (in black)(2 in the front and 4 in the back).
A:AnswerThis EliteDesk Desktop has the Windows 10 Pro operating system. The Edge browser will be already loaded, however you will not be restricted from using any of the other browsers if you would like.
A:AnswerHi HisChild. This HP - Refurbished EliteDesk Desktop only has a wired Ethernet connection. You could add a USB Wireless adapter to this desktop to use WiFi.
A:AnswerYes. Here is a link to the Hardware Reference guide. Chapter 3 shows upgradrades - page 68 specifically talks about adding cards. Here is the guide:
http://h10032.www1.hp.com/ctg/Manual/c03803181