HD boots from desktop but "Invalid System Disk" error on laptop?

Hi,
I posted here because I think the problem I have is in the MBR of a HD
and is not specifically a laptop issue. I purchased a working IBM
Thinkpad 560x laptop. I took out the hard drive to use in another
laptop and purchased a used replacement 4GB laptop HD.

I loaded WinME on the replacement HD by using a 2.5" to 3.5" IDE
adapter and putting the HD in my desktop PC (the laptop does not have
a floppy, CD or any other drives). I can consistently boot the
desktop PC fine from the replacement HD. However, every time I
connect the replacement HD in the laptop, I get an "Invalid System
Disk" error. I can boot the laptop fine using its original HD.

Any suggestions as to the problem and solution? The laptop BIOS
supports the 4GB natively without requiring any overlay, so that's not
it. No other floppies etc have been left in the laptop because it
doesn't have any other drives.

What's weird is that I can boot from the replacement HD from the
desktop PC but get the error in the laptop. So AFAIK the MBR should
be OK. I've done this before in an identical laptop with no problems.

I've also loaded the Win9x folder from my WinME CD onto the HD and set
up WinME from the HD in the laptop. When it was time for the system
reboot as part of the WinME setup, I got the same error.

TIA

alordofchaos@yahoo NO SPAM.com (Anonymous Jack) wrote in message news:

Anyone, to the questions below? Not even a guess?

I posted here because I think the problem I have is in the MBR of a HD
and is not specifically a laptop issue. I purchased a working IBM
Thinkpad 560x laptop. I took out the hard drive to use in another
laptop and purchased a used replacement 4GB laptop HD.

I loaded WinME on the replacement HD by using a 2.5" to 3.5" IDE
adapter and putting the HD in my desktop PC (the laptop does not have
a floppy, CD or any other drives). I can consistently boot the
desktop PC fine from the replacement HD. However, every time I
connect the replacement HD in the laptop, I get an "Invalid System
Disk" error. I can boot the laptop fine using its original HD.

Any suggestions as to the problem and solution? The laptop BIOS
supports the 4GB natively without requiring any overlay, so that's not
it. No other floppies etc have been left in the laptop because it
doesn't have any other drives.

What's weird is that I can boot from the replacement HD from the
desktop PC but get the error in the laptop. So AFAIK the MBR should
be OK. I've done this before in an identical laptop with no problems.

I've also loaded the Win9x folder from my WinME CD onto the HD and set
up WinME from the HD in the laptop. When it was time for the system
reboot as part of the WinME setup, I got the same error.

TIA