If so, put Linux Mint MATE 17.1 on it and boot to it.
http://www.linuxmint.com/edition.php?id=173
https://www.youtube.com/watch?v=uWO3vif7hTw
https://www.youtube.com/watch?v=KSb7xUJHxes
That will suffice until you get a hard drive. If you use Unetbootin, so you can have persistence on it, then you'll fill 6GB of room. If not, so it boots to default settings each time, then you can do with 2GB size.
I found almost brand new computer next to rubbish bin of a office building . it looks really in good condition but one problem , hard drive is missing now I'm trying to find out which hard drive would be compatible.
Please help.
Thank you in advance

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