RE: PE 1850 Will Not POST or Enter Setup
If it is hanging at the "LSI" controller init and you are NOT using it, then make sure it is disabled (BIOS F2, Integrated Devices, Embedded RAID) ... I know you said you can't get into the BIOS, but if you clear the NVRAM using the jumpers on the motherboard, it will revert BIOS settings to defaults, including disabling the embedded RAID controller.
You said the LCD is amber ... what is the message on the LCD?
With RAID disabled, you should not see LSI - you should have only the Adaptec SCSI controller visible during POST.