Quick answer, yes.
More detailed answer, it depends on several things.
1. Is the motherboard battery still in place? Is it leaking? If so, that will definitely reduce the value of the computer.
2. Does it even boot up? BIG affect on value.
3. Which version is it? 3000T/030 or /040, or 3500? That's usually found on a sticker on the back panel. IF I remember correctly.
4. Where are you located? If I remember correctly, that thing weighs a TON! Shipping could be quite painful.
As far as a monitor, it has vga output so just about any standard PC monitor will work with it. Just make sure the 15KHz/31KHz switch is set to 31. So you can at least set it up and see if it works and what you have.
That's my 2 cents. Anyone else want to chime in?
Oh, BTW, if someone tells you it's absolutely worthless and you should just give it to them, laugh at them and walk away.