Q: how do i restore mac

As requested in your other post, what OS did you have, what media, that is a CD, do you have to use?  What Mac do you have?

If you mean ou erased the hard drive, put the Mac OS X CD in the disk drive and restart the MacBook, holding the C key until it boots.  Then select language and select install and select the hard drive.

Ok, after you have booted to the install CD, go to Utilities, and the Disk Utility and see if it recognizes the hard drive.

In your other post, and why we need to work with only one right now, you said you don't know what you did to lose the hard drive.  We're you doing any thing with Disk Utilities at the time, such as format the drive?  Or did you do something like drag the drive to the trash or eject it?  If the latter then the operating system is still on there and what needs to be done is is simply mount the drive.

Well, that is good, at least it sees the hard drive.

What you can do at this point, if you think you formatted the hard drive, or tried to, in Disk Utility click on the Toshiba hard drive.  Then in the main window pane do you see buttons top center that say something like erase, partition?  If so, select partition, and see what options it gives you for the format.  What we want is Mac OS Extended (Journaled).  So we get the drive formatted the way the installer wants to see it.

If you have the Toshiba and untitled, is untitled a sub item after Toshiba, that is indented a little?

If that has been formatted, try bringing up the installer again on the disk and select untitled as the destination.

Let's start over, now that we know the disk is formatted correctly and the install disk actually works.  Start the machine and boot to the 10.4 install disk.  Select the language, agree to the tems, and then we should be at the point that you can select the install location.  Choose the hard drive and do a basic install, the esiest and cleanest at this point...we just want to get the system up and running normally right now.