Toshiba m400 builtin hard is offline

You should check in your BIOS settings to make sure your internal hard drive is designated as your primary boot device. If it is and the system still does not boot up, you either have a bad hard drive or the ribbon cable has come loose. There is an outside possibility that your MBR (master boot record) has become corrupt and the drive would have to be reimaged.

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i did find this manual for it
http://support.toshiba-tro.de/tedd-files2/0/userman-en-20070720154127.zip
maybe it might be somewhere in it of how the bios sees the hard drive. normally a bios will boot to the DVD drive first then a hard drive so make sure you dont have anything connected like a USB or a cd in the DVD drive unless it is the OS software. also disconnect the network cable if it is plugged in.

when i loading os its showing no hard disk.

Toshiba page is the BIOS first boot page and should boot from either the DVD ROM or the CD ROM then the hard drive. I would go into the BIOS and set it to boot from the hard drive first it is seeking the ROM drive and stopping. If it does not boot to Windows from the hard drive then you have lost the initial boot file.
Or they are corrupted and you will need to restore the computer back to factory settings. You should have the software that came with your lap top it is not really a problem if you follow these instructions. If you have never done a reboot it is strongly advisable to get someone who has done this before to do it for you. I hope that you saved your important documents and files pictures etc to an external source first.
There is another option to watch the screen when it boots see if you can use F10 or F8 or F1 or F2 to get into safe mode during the boot process. It should tell you which key you can use to get to setup from there you can change the boot device process under boot options to hard drive first boot or it may tell you boot order key information. Whatever it is get there and change it to hard drive first boot. I would highly recommend a repair shop or a friend who knows what they are doing if you do not to handle this problem. John

dear zy_martinez, get in to the Bios setting and look for SATA setting and disable it, now try to install again.

You need to activate the Raid diver. This can be done by slipping it into the XP install or adding the Raid Drivers at the time of installing the operating system. See Toshiba.com support pages for a copy of the Raid drivers

Open your system bios setup. Then under the boot options make sure your cd drive is one of the drives enabled in the boot path. Hope this helps & please remember to rate my answer. Thanks.

I assume the pc does not boot to windows without this file.
You can reinstall windows. However, this will likely remove your data in the process.

If you can get into the BIOS, see if it can boot from the network or a USB drive. If so you can download something based on Linux that you can so boot and that is able to read/write to NTFS partitions.

The easiest way to replace this file for someone with little or no experience in these matters is to remove the hard drive from the tablet & hook it up to an IDE/SATA to USB adapter. Then plug it into a desktop.USB Port and it will be seen by the host PC as an add on hard drive.

Fadeel, You enter the BIOS on the M400 by pressing the ESC key during the POST operation. Let us know if you have any other questions and please don?t forget to rate this post.