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The Boot Graphics Resource Table (BGRT) is an optional table that provides a mechanism to indicate that an image was drawn on the screen during boot, and some information about the image.
The table is written when the image is drawn on the screen. This should be done after it is expected that any firmware components that may write to the screen are done doing so and it is known that the image is the only thing on the screen. If the boot path is interrupted (e.g. by a key press), the valid bit within the status field should be changed to 0 to indicate to the OS that the current image is invalidated.
This table is only supported on UEFI systems.
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Quote:
The BGRT is an ACPI 5.0 feature that allows the OS to obtain a copy of the firmware boot splash and some associated metadata. This is intended to be used by boot splash applications in order to interact with the firmware boot splash in order to avoid jarring transitions.
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Reports are that this problem appears on UEFI computers since about kernel 3.18
It seems that a problem with BGRT should not prevent the OS from booting, just slow it down.
When you see the Grub menu, press "e" for EDIT, replace the words "quiet splash" with "nomodeset"
Then watch the display as it boots, for error messages.
I am assuming that you are installing in non-UEFI mode, right? Did you set the computers boot settings correctly for CSM/Legacy boot?