One possibility is an ACPI related issue. If you conducted an installation, you did so from the ramdisk kernel, which does not use ACPI.
Easy enough to test: disable ACPI in the kernel during bootup, and see what happens.
At the "boot>" prompt, type "-c" to enter the User Kernel Configurator.
The kernel will load, and before doing much else, will give you a "UKC>" prompt. Type "disable acpi", then type, "quit" -- the kernel will continue onward, with its ACPI code disabled. If the OS comes up, you'll know your problem is ACPI-related.
The ACPI standard is very loosely written, and every hardware manufacturer's implementation is a little bit different. Some are downright broken. If it works with Windows, it's usually good enough for them.
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