Hmm... I have the 8887 as well. The numlock light should come on when you press the NumLk key (without pressing anything else) and scroll lock should come on with you press fn+NumLk... I don't know why the light wouldn't be coming on. I guess there are many possibilities... Here's what I would suggest:
Check and see if pressing numlock actually does enable the use of the keypad (type in a word processor and see if you can get numbers to show up). If this happens, then something's wrong with the light.
Check the bios, you can set numlock to turn on or off in the bios during boot up. To get to it, hit ctrl+alt+d I THINK, lol, it should say on the bottom of the screen during boot up (it only shows up momentarily, so you may have to restart multiple times to get into the bios). Don't change anything in the bios unless you know what it is, lol. Could make things bad.
Otherwise, it may be a faulty keyboard connection... I'd flip it up and see if the ribbon is plugged in tightly.
Let us know! Best of luck to you!