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Whenever I boot ubuntu 12.04 from grub, it takes me to the login screen but the screen is completely blank (no backlight at all). I'm running a 64-bit Compaq Presario CQ45 with Intel Intergrated Graphics (Intel(R) HD).

I can connect the laptop to an external display at see ubuntu fine on the external display, but I can't see ubuntu on my laptop screen unless I change the resolution down a little and then ubuntu appears on my laptop. But this only lasts for about 30 minutes and the screen goes blank again.

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fn + [your display for projector, example F3 for leno]

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That does nothing. –  user80043 Jul 29 '12 at 13:03

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