the "Scott" handlebar and the triple-spoke chainstay protector made me think of this bike I saw the other day





The construction on your bike and that Scott Boulder are pretty much identical down to the triple spoke holder and wrap around welds on the seat stays, though it looks like you may have slightly lower end components (or the yellow one's been upgraded).

Incidentally that is also the same frame as the early Diamondback Apex (which came in celeste green). I have an apex and it rides great so I expect yours does too The components are not what was spec'd on the Apex though. The color definitely looks like a match.. not sure if Scott also put out a celeste green mtb tho.. I seem to vaguely recall seeing a Scott that was the same color as my Apex but i could be wrong.

Here's a nice example of a mostly stock apex



I would guess it's a Scott, but I agree with T-Mar, what is the serial #?