More classic computer on topic....

Assuming this is a real IBM one... Do not force it. The metal actuator on the back of the loc enganges a hook-like projstion on the platic case front IIRC. Forcing it will break soemthinn (most likely the plastic panel that holds the lock and the 2 LEDs. It's a 7 pin ACE tubular lock, of course. Similar to the DEC frontpanel lock (you know, the XX2247 key), but with different pinning. I am not sure if all 5170s were pinned alike or not (something tells me they weren't). Anyway, if you know a good locksmith, or have a suitable tubular lockpick, then pick the lock. It's not that hard. You neve need to lock it again, of course, once it's unlocked, the case will come on and off easily and the keyboard will be enabled (another function of the lock is to aoperate a microswitch connected to the keyboard interface IC). The easiest way to do it with minimal damage if you can't get the lock picked is to ask somebody who has one of these cases open (I'll do it if necessary) to determine the positions of the screws hodling this little lock/LED panel in place. Then drill neat holes through the plastic front, remvoe the screwes, fiddle the panel about to free the case and get it off. Once the case is off, you cna remove the panel completly and then remove the lock from it. Then dismantle the lock and reasseble it in the 'open' position. Maybe re-pin it to suit a key you have (I've alwyas thoguht of repinning the one on this PC to take a DEC XX2247 key :-)). It shouldnt be too hard to fill the holes you drilled in the case. -tony