Hello,
almost every time the first startup ends with a frozen system, sometimes with a complete desktop but frozen mousepointer, this little icon like a hand with stretched forefinger, sometimes with incompleted desktop and parts of dialogboxes without descriptions and so on (and frozen mousepointer, too).
The second startup after rebooting is more often than not successful even though rebooting is a little bit difficult from time to time.
ALT-CTRL-DEL may work but often does not work too.
I didn't try out whether or not the third startup would be like the first or how long the delay has to be to produce this behaviour.
It seems that nervous handling with the mouse during booting causes this problem very sure but even if I don't look at this nice mouse it may happen.
Just yesterday I changed an item in bios that controls the behaviour of input pointer, that means touchpad and/or mouse.
I changed from "Auto" to "Both" and Haiku did not boot! Not even the boot logo, these 5 or 6 pictures lighted up with the progress of booting did appear.
(I hope you understand my confused and helpless explanations)
Finally a short description:
HP Omnibook 6000, Pentium III, 850MHz, 384MB RAM, PS/2-Mouse, ATI Rage 128 or something like this,
20MB Harddisk, Ubuntu 10.10, Haiku and GRUB
Best regards
Manfred