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When booting from a diskette made from boot-RHEA-1999:044.img, the boot process stalls at the point it says "Running /sbin/loader...". The system remains completely catatonic requiring either a hard reset or a power-off/power-on cycle to break out of it. I'd run into this on a Gateway E-4300 (Pentium III) which was a new installation so I fell back to booting directly off the RedHat 6.1 Installation CD and was ultimately successful. I downloaded the boot diskette image, again, this time to a different system and make a new boot diskette from it. Just yesterday, I tried installing RedHat 6.1 using the new boot diskette on a completely different platform (IBM PC 365) and got exactly the same symptom. This time, however, I figured out what was going on. Since the CD-ROM drive on the IBM PC 365 is a lot noisier than the Gateway's I noticed that the RedHat 6.1 Installation CD-ROM was accessed quite early into the boot process. In fact, it's accessed at the time the message "Running /sbin/loader..." is typed out. I've always had the installation media in its drive, ready to go, so it never occurred to me to wait for the prompt for media source and then insert the CD-ROM at the time of the prompt. When I took the CD-ROM volume out and waited for the prompt, then inserted the CD-ROM volume and selected local CDROM for media source, the boot process then did what it was supposed to do, prompt for the updates diskette, then (in this case) enter the graphical installer. The rest of the process proceeded without further incident. It appears the that diskette boot image is mounting and using the CD-ROM file system way too early. It should not be referencing the CD-ROM drive at all until that media is actually selected for use. The work-around is to wait for the media prompt before inserting the CD-ROM volume.
This is a known bug which results from a race condition. It will be fixed in the next errata that we release (if we need to release further errata that is :-))