Computer says no operating system found,fujitsu T4215 im pretty sure my c drive was completely erased.

if the hard drive has been completely erased then you will need to boot from a windows disc and re-install windows on it.

This is a step by step to take apart the computer, you can use it to also replace the lcd panel. http://simshsia.wordpress.com/2008/07/15/disassembly-of-the-fujitsu-lifebook-t4200-series-tablet-pc/

Do you have Windows 10? As there may be an issue with screen rotation.

However to check your settings:

1. Place the tablet into Pad/Tablet mode.
2. Click the Start menu and select Settings.
3. Click System.
4. Click Display.
5. Scroll down and check the status of Lock rotation of this display .

Your computer could either have:
* bad RAM -- causing "random" errors
* bad spots on the disk-drive -- information cannot be written, or, after successful writing, cannot be read from the disk.

Download a free RAM-testing program, e.g., 'MEMTEST86+' -- it can boot from your CD-drive, and run exhaustive tests of the RAM.

Or, replace the disk-drive, to see if that bypasses the problem.

Hello,

There you have pictures + explanations for all T4200 series.

Keyborad only:
http://forum.tabletpcreview.com/fujitsu/18758-disassembly-fujitsu-lifebook-t4200-series-tablet-pc-2.html#post164066

Full:
http://forum.tabletpcreview.com/fujitsu/18758-disassembly-fujitsu-lifebook-t4200-series-tablet-pc.html#post119204

Leave rate if I helped you, thanks!!

Cheers,
Mike

You need to send it to Memphis, Tn for a factory reset, call the Fujitsu 800 number on there web site and have your serial number handy.

Don't disassemble a Fujitsu!! Ever!
They automatically lockup as a security precaution, aren't you glad you saved some money?

You either have a failing hard drive or corrupted operating system. Since you don't have the Win 98 CDs, you won't be able to try to fix the operating system. It's tough. Hope you have backed up your data files.

The hard drive has either been damaged and can't be read, or its connection was knocked loose from the motherboard. Open whatever cover necessary on your computer to get at the hard drive and make sure any connecting cables are properly seated. If the drive was damaged by the fall you will need to replace it and restore your system.

Operating system not found? I have got Windows Boot Genius to fix problem safely!

ser guides are here:
http://support.fujitsupc.com/CS/Portal/support.do?srch=GUIDES
I didn't see this model listed, so perhaps the number is wrong?
If you have an operating system disk, you should be able to reinstaIl  by just inserting the disk and following the prompts.
checked one model, and that seems to be the method Fujitsu uses.