HELP! is my G2 broken?

ive had this camera for about a month. this morning i encountered a wierd problem that was never there before.

lets say i take a picture in P (program AE) mode, with flash. It gives me the aperature and shutter as 1/60 and 2.0. The exposure and flash settings are set to the center, 0.

i take the picture and it looks fine.

then..i switch to manual mode (M).

I try to take the exact same picture, with the same shutter and aperature. Also, when i press the shutter half-way down, on the left side of the LCd screen, it tells me (-2) in red, which is saying that it is UNDERexposed right? but when i take the picture, it looks overexposed and the flash looks like 100x stronger...

but none of these problems occur when i dont use flash in any of the pictures.. what could be messed up with my camera? or is it just a setting that i screwed up on?

From what I understand, the camera is working correctly.

If I get this wrong, someone please correct me.

In manual mode, the camera determines the "correct exposure" based on the ambient lighting - without considering flash. I assume that is why it said you were so underexposed. The flash always fires at full strength in Manual mode. That probably has to do with the overexposure.

In P, or Auto, the camera will determine the correct exposure taking into consideration the flash. It can also vary the amount of flash power to get the correct shot.

As weird as it is, it is working correctly.

Now what I want to know is why I tried to use manual mode with no flash for a long exposure, set the A, set the T to about 4 seconds knowing that would get me started (night shot of the city in the distance). The camea told me I was -2. I kept lengthing the shutter until I got to 13 seconds and the camera told me 0 at half press. I thought that was really way too long, but took the shot anyhow. Man! It looked like daylight outside. I lowered it back down to around 4 seconds and the camera told me I was under exposed, but I took them anyway. Those came out great. I don't quite understand why M told me I was so far underexposed.

Anyone else have any clue?