I have inherited a Mid/Late 2007 MacBook Pro from a colleague (A1226) but it doesn't work. It won't start up at all. No boot, not even the SuperDrive sound. I've tried resetting the SMC but it didn't do anything. When I connect the charger, the green light comes on, but that's the only sign of anything I see. It's also missing the battery. He doesn't remember what happened to this particular computer but the battery is broken open. Looked like some serious damage to it.
I'd like to get it working even without the battery, but I don't know what to try. I've read on here that it may be the DC in board? ifixit has a nice guide to remove the DC in board (https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Core+2+Duo+Models+A1226+and+A1260+Left+I-O+Board+Replacement/678) but I don't want to try it unless I have some evidence it may be this.
What can I try to help diagnose the source of my issue?