You can configure the mode to use by setting the hdmi_group and hdmi_mode values in /boot/config.txt – see config.txt documentation on raspberrypi.org.
You can find out which values to set as follows:
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Boot your Pi having switched the monitor on first so you get a picture.
Run [b]tvservice -s[/b]
This will display something like:[code]state 0x120016 [DVI DMT (58) RGB full 16:10], 1680x1050 @ 60.00Hz, progressive[/code]The important bit is the DMT (58). You might have CEA instead of DMT – whichever it is defines the value to use for hdmi_group (1 for CEA, 2 for DMT). The value in brackets is the one to use for hdmi_mode.
You can find out which modes your screen supports by running [b]tvservice -m DMT[/b] (or CEA if tvservice -s returned that) and pick another one if you like. It’s a good idea to use one that is 60Hz as that matches the vsync rate games are written to work at.
Edit /boot/config.txt and add hdmi_group and hdmi_mode lines with values found above.
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