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"Your original grub menu has XP on the second partition of the primary drive but above you say it is on slave."

Please show me where I have said that? I have never said "it is on slave". I have XP & Fedora each on their own HARD DRIVES. So how can they be on partitions?! I said XP is on the PRIMARY SLAVE DRIVE. I never said anything about partitions. Fedora 13 is on PRIMARY MASTER DRIVE.

I haven't a clue where you got "partitions" from.

I think that you're thinking "dualboot" = partitions on one hard drive. That's what it was on most systems. I'm creating my own thing: I used to have dualboot on partitions on one hard drive. What happened? The Windows OS died, but the Linux partition is alive and kicking. As I upgraded from Fedora 12 to 13, I got rid of the partitions and used the whole hard drive. Then it just happens that my other Windows hard drive recently died, so I got a new hard drive for Windows. But wired it so that Linux is in the MBR, meaning it's the first partition or hard drive / volume [Primary Master Drive [C: or "C drive" in Windows language] or /sda in UNIX/Linux language] detected when the computer starts.

"I have read the posts and I am confused."
That's not MY fault. I just have a unique problem you probably never experienced.

"In fedora from terminal as root run command fdisk -l and post the results."
Uh... I believe I've posted the results of fdisk -l in my initial post.

I think the entry should be in this order. I've had trouble in the past with the makeactive line and sometimes had to remove it.
I also think if your is incorrect that will cause problems too.

Today with multiple errors on the screen via the Startup Menu, I suddenly could use the grub menu with Windows XP [This is what I'm using now]. I haven't been able to use it for the past few weeks. Other times, it will show Error 21.

Error 21 means that grub is unable to find the disk entered in config file. It was either wrongly written or it BIOS was not able to see it (like unplugged USB FLASH disk or similar).

I think this is the problem:
Windows BIOS & MBR. When I can see "Secondary Master Drive[Windows XP]" in Startup Menu via BIOS, then I can get into Windows XP with Grub menu in Linux.

I think the following 2 points are useful:
1. When I used Windows XP AFTER Linux, I CAN'T go into Windows XP with Grub menu.
2. When I used Windows XP BEFORE Linux, I CAN go into Windows XP with Grub menu.

This is so WEIRD!!! Otherwise, it will show Error 21 when going into Windows XP via Grub menu.

Can someone confirm this? If it's confirmed then I will make this thread as SOLVED. Thanks.

Try commenting out the savedefault line in your grub.conf file.

#savedefault

"Try commenting out the savedefault line in your grub.conf file."

I have no savedefault line to comment out. There is no savedefault line in my grub.conf file.

Are you talking about swapping the bios order of the way hds boot when you refer to XP after linux and XP before linux?

Yes

In order to get accurate help you will need to quit changing the bios hd boot order. It gets confusing and can make you think you are getting bad advice. When you give an error code stay with that boot order till it works. You can not change bios boot order and expect a boot loader to work.

Sorry, Larry.
I have misunderstood you. I just read you reply. I'm comparing the two hard drives that I have & what I see in grub & Windows BIOS Startup Menu. What I mean is:

1) If and only if I had used Windows via Startup Menu anytime prior to using Linux I will NOT see error message 21, when I go into Windows via grub menu later on.

2) But if I use Linux first and later I use Windows and still later on the same day go back into Linux, I will see Error 21 instead of going into Windows XP via grub menu successfully.

What I meant was I must use Windows before I use Linux in order to get into Windows XP successfully [Either via grub menu or BIOS Startup Menu]. If I do the opposite and use Linux [either via BIOS Startup Menu or grub menu] before Windows there plenty of chances I could run into problems with the computer and have to take plenty of time to solve these problems.