"The message below is for a friend. "
Dose it realy matter who it's from or for?
"Can't boot my Windows XP hard drive."
A hard drive cannot be OS specific, at least for your standared IBM PC any way.
"At boot time I get a black screen (the words "no signal" are displayed)."
This means your monitor is not getting a signel, to fix this you should check all the connections to the monitor, if they are fine you should check it with another monitor, if that fails then your graphics card is probabley dead.
"I've tried installing the disk as a slave on a second computer (Windows ME) but the the drive is not even visible in Windows (although it is visible in the BIOS setup screen)."
Of course it wont asuming you used New Technology File System filesystem for XP, Windows ME dose not support the NTFS fielsystem.
"I can however view the contents of the drive using a small utility called "Drive Rescue". So if necessary I could probably save all the data I need to another disk."
If they utility supports NTFS filesystem, thats not supprising.
"Ideally, I'd like to try to boot from CD but how can I configure DOS to boot from CD when screen is blank."
Don't even atempt this untlill you have tested the monitor and graphics card. Oh and what you refer to as DOS is not DOS at all in any shape or form, it is the BIOS you refer to.
"Also, if I manage to do this, what is the next step to make HD bootable again assuming it is a configuration problem and not a hardware problem?"
It should be fine now. Asuming it is the graphics card and/or the monitor at fault.
>> Stay informed about: Boot problem