Major Issues with my Macbook pro

So, one day a few weeks ago my Macbook pro started to really mess up. It keeps starting up in safe mode.

First it was the keyboard, just stopped working. I have no clue how to fix it and have been using an external keyboard.

Then it stopped registering that it had any sound output or input devices. I still get the chime when I start the computer up but at the login screen there is nothing. Even external speakers don't work.

A few days later it all started working for about half a day after I connected it to a friends macbook pro trying to transfer some files before I reinstalled the OS. But it suddenly restarted itself and since then it won't register that it has a wireless card in it and won't let me even see an airport option.

Reinstalling the OS has not helped anything. I'm kinda at my wits end about the thing and am really hoping someone can tell me whats wrong.

The computer is currently running OS X ver. 10.4.9 and has a 2.4 GHz Intel Core 2 duo processor. Please help me fix this.

Did you spill anything on your MBP? Even a spill from months ago?

No, I've always been careful to keep liquids away from it for just this reason.

With all those symptoms it sounds like a failing logic board. That's why I asked about the spill. If you haven't already backed up your data, backup what you can before it quits altogether. Your machine is likely a 2007 model which means it's going on 5 years old. It may not be worth spending a lot of money on for repairs. You've got a decision to make.

I'm planning on buying a new one when I get back from basic in a few months but I was hoping to salvage this one until that time came.