Difficulty connecting my external monitor to my macbook.

I'm having difficulty connecting my external monitor (Acer) to my macbook.
At first, It worked fine. Then, about 2ish months later, it stopped working.
Now, when I hook the external monitor up both monitors start flashing a blue screen.
I thought it was because my adapter broke but I bought a new one and the problem still persisted.
I hooked the external monitor up to a pc laptop and it worked just fine.
Any suggestions????????

What Macbook Pro do you have? Does it have an HDMI port? Does it have a minidisplay port? If it has an HDMI port get an HDMI cable. If it has a Mini display port get a mini display port to HDMI adapter and an HDMI cable.
Does ypour monitor have other than an HDMI port such as a DVI port?

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