Purple screen delay at Ubuntu 11.04 boot

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http://askubuntu.com – I've got Windows 7 & Ubuntu 11.04 installed on my PC. When I install Ubuntu, it came with GRUB. On GRUB, when I select "Ubuntu" on boot menu, I've got a purple screen during 16 seconds, and passed 16 seconds it shows the boot screen and loads the desktop. Actually, I've got BURG installed on my PC but now, when I try to boot Ubuntu, it shows a black screen with a blinking cursor durin 16 seconds. Can I remove that delay? And sorry for my bad english, I'm from Argentina. (HowTos)