"I have purchased a used 3750G-24TS switch, it is of the older generation it is slightly larger than the current models as the front fo the switch has some vents.The switch does not have an internal power supply and I am confused as to which power supply this switch needs to make it work."
"Secondly I understand this model is not POE, if I purchase a power supply that supports poe can I make this into a poe switch or is there naything i can do to make it into a poe switch?"
To solve this problem, you can easy use PoE patchpanel to work this switch as PoE switch. Cisco Catalyst 3750G-24TS switch is an innovative switch that improves LAN operating efficiency by combining industry-leading ease of use and the highest resiliency available for stackable switches.
Powerful WS-C3750X-24T-S Catalyst 3750-X Switch
Easy-to-use enterprise-class lines of stackable and standalone Cisco WS-C3750X-48P-S switch