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Check that your server supports 'lights out management' / 'out of band management' or if it can be enabled or added with a hardware module.
If it does, like my HPE Microservers, you can do everything (control power, view startup info, manage BIOS) from a remote machine and don't need a monitor at all.
If it doesn't, the cheapest solution is to plug in a desktop monitor you already own. The next cheapest is to get the crappiest second hand monitor you can find or scrounge.
Specialised kit is much more expensive.
chez_jay
Any recommendations for a portable monitor? HDMI, not USB. Preferably powered by either USB or with a battery. A reasonable resolution but doesn't have to be HD. Not really fussed about accurate colour or sharp picture.
Really just want it to occasionally to plug into my server when I want to change BIOS settings or need to troubleshoot something so the cheaper the better.