Buying used ps4

[0oGOkuo0]

Hello everyone im planning to buy a used ps4, i know iknow i should buy new instead right but my job is contractual meaning my job will last for only six months and after this college ,i cant work so this is my opportunity to buy,new ps4 pro in my country cost 470 in usd and used cost between 200-350 usd and my salary per month is 160usd , planning to buy on facebook marketplace and most ppl reasons for selling is busy at work So they dont have time and buyers can test the system in the sellers house for as ling as they want. My question is how can i check ps4 for defects like should i remove previous owners psn, whats more?? Please tell me everything what should i keep in mind and what more test should i do??

[Master Disaster]

Check it reads disks

Check it connects to WiFi and Ethernet

Check it can access the play store

Check the controller works

Check it has the correct size HDD

 

If all these are good then it should be OK.