I downloaded RH6.1 iso and made a CD out of it. Then I tried to install it but every time I get to the point it asks me to log in for the first time, no matter what I type for the username it doesn't even prompt me for the password but instead displays some error message for a fraction of a second and then, poof, clears the screen and displays that login prompt again.

When I enter random usernames fast enough, I can see that error message:

"BUG IN DYNAMIC LINKER ld.so: dynamic-link.h: 57 elf_get_dynamic_info: Assertion '! "bad dynamic tag"' failed!"
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There's two possibilites as to the cause. It's possible that you've got a bad download. and some of the images installed are thus corrupt. The easiest way to check would be to try installing from the CD onto another machine, or to borrow a "known good" CD and install from it.

In my mind the most likely cause is bad or flaky hardware. It could be the disk drive and/or controller, memory, motherboard, video card, or some other component in the system. Trouble shooting a problem like this is mostly a process of simplification and substution. Simplify the system as much as possible, leaving only the MB, memory, and disks. Then change one component at a time until the problem goes away. Personally I'd suspect memory, video card,  and MB, in that order.

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hennoAuthor Commented:
I got rid of that problem by installing 6.0 from another disk and then upgraded it to 6.1

Maybe it was a bad download but how come it didn't say anything when it was writing it to the CD? Or maybe I resumed the download and something went wrong (incompatible server and client) and it resumed with a slight offset?

Well it's back up and running now but thanks anyway.
Download errors shouldn't happen, but they do. An interrupted/resumed transfer can cause the problem, the ftp server could have glitched, of the ftp client could have glitched. The dead giveaway is that usually the downloaded file size is wrong.

I like to compare file sizes, especially after a large download to see that they exactly agree.
Unfortunately, a number of the GUI ftp clients thoughtfully round the file size information, so for critical downloads I suggest using a command line client.
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