@DD06
Your machine has following port at its back
Figure : ProstT 24 back I/O ports

Lock slot
Disk activity LED
USB 2.0: 2
LAN (Ethernet)
Power LED
DC power in
USB 3.0: 2
HDMI out
Headphone/Microphone
On many AIO and notebook/laptop machines, the Headphone/Microphone combo port does not support a stand alone microphone. Your machine probably is one of them. Have you tested it using a headset ?
Regards.
BH***
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