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Yosemite Pre-Installation Screen Glitch

Joined
Mar 30, 2015
Messages
1
Motherboard
ASUS Z77 motherboard
CPU
Intel Core i7-3770
Graphics
Intel On-board Graphics
Mac
Classic Mac
Mobile Phone
iOS
Hi, guys...

Turns computer on.
Enters BIOS.
Goes into boot menu.
Selects USB flash drive with OS X Yosemite.
Selects "USB" on MultiBeast screen.
Screen with Apple logo and progress bar appears.
Progress bar starts... progressing.
Screen goes black after reaching a certain point.
Screen flickers.
Screeen with top part grey and bottom part black - and tearing - appears.

What's causing this? And what should I do?
*Monitor is a VGA. Using HDMI-VGA adapter*
 
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