Black screen when running MIDlets on a real phone (motorola V330)

Hello.
I'm developing a simple Java ME application as a part of my senior project in college. Up until this point I've been working with emulators and everything works fine. Yesterday I tried to upload and test my application on my old phone - Motorola V330 (CLDC 1.0 MIDP 2.0).
I can upload and install MIDlets without problems. (Using unlocked application loader and a USB cable). When I try to start them, the screen goes black and stays black. If I hit the "exit" softbutton or the red power button, I can see my application for a split second before the program exits. For example if I try to run a game, I see the game screen for a split second, if I try to run a form, I see that form. That tells me that the application can start, but I dont know why I get a black screen.
I tried that with a bunch of applications, even for a simple form with "hello world" on it, the screen goes black.
I also tried some games from SUN examples and I have the same problem.
Anybody can give me any hints on how to solve the problem? Could this be the phone issue or is it some sort of security certificate issue?
I tried googling the issue and searching these boards but I cant find any concrete solutions.
PS. The phone is old and is no longer connected to the network, but it still has a sim card.

Yeah, it's CLDC1.0 and MIDP 2.0.
I've looked at the phone again and found out that in "Java settings" menu the "backlight" option was turned off by default. Turning it on allows me to see my java apps. So the problem is solved.
When I had similar problems with my laptop (black screen, barely visible text) it took me a ridiculous amount of time to talk to technicians over the phone and try to explain to them what I'm seeing. Apparently the problem was the same - the backlight on my laptop's display was malfunctioning. I hope this info will help some of you or at least will help you googling stuff if you ever encounter the same problem.

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