You have a laptop with ATI Mobility Radeon HD 4650 (in my case Sony Vaio VGN-FW46M) and your OpenMandriva 2013 Beta does not show a screen after installation and booting?
I wrote about this issue last year already but it's a bit different with this new release.
Here is what you have got to do:
Select in grub boot menu that you want to edit the entry.
then you add the following line in the menu entry:
You will be very pleased to see that OpenMandriva 2013 will boot for you now ! :)
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