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karj
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BEST ANSWER  decided by votes   |  karj  |  March 07, 2009 08:02 AM
These are not my points. I am just copying and pasting from http://www.techsupportforum.com/microsoft-support/windows-vista-support/260386-operating-system-not-found-error.html. Somebody i know of found this solution useful when he got the error operating system not found in his hp computer. Here is the solution

Perform a Check Disk to repair settings

1. Enter the Boot options menu by pressing F8 as the computer starts up.

2. Select Safemode With Command Prompt

3. Once loaded, in the Command Prompt type chkdsk C: /f /r and press enter.

4. Once it has completed reboot the PC into Normal Mode

If this fails

Try the Startup Repair

1. Enter the Boot options menu by pressing F8 as the computer starts up.

2. Select Startup Repair from the menu.

3. Follow the onscreen instructions which will take roughly 5 - 10 minutes to complete and should reboot itself.

If this issue isn't fixed after this the only other thing would be to reinstall to see if that will fix the issue.

Reinstall Vista using Recovery Partition

1. Enter the Recovery Console menu by pressing F10 or F11 as the computer starts up.
**This is a small window so may take two or three try's. You may also consult the user manual to find the key used to enter the Recovery partition

2. Select The option to Reinstall/Install Vista

3. Follow the onscreen instructions to complete the full installation at which point it should reboot.

4. Once it reaches the desktop (If it has worked) let the software explorer reinstall the software, this can take roughly about 15 minutes

Failing this it might need the hard drive fixed or replaced.....

Using the Warranty

1. Take it back to the store who can then confirm you are JUST within the warranty period and they will send it to get repaired

Hope it helps
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cyndilou
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cyndilou  |  March 07, 2009 06:18 AM
Try reseating the hard drive, and the memory as well.

Make sure that the system is fully powered off (and for best measure, unplugged) before you open the case!

Also, try using a little compressed air (from a can, not an air compressor :) to clean the fan and any dust out of the other areas of the system while you have the case open.

Often a system not booting is caused by a loose cable or memory card, but it could be something more serious, such as a failing hard drive or other hardware component. It's a good idea to back up your data, and if there are any hardware diagnostics provided by the manufacturer you can run them to see if any issues are found.
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eastwind87
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eastwind87  |  March 07, 2009 06:19 AM
I had this happen to one of my computers. The cause seemed to be hard drive failure. I would go and buy another hard drive -- and if you don't want to go through the trouble for that just yet, try reformatting your computer and then reinstalling.

Backing things up on your computer once every two weeks is a good habit to get into, in case this happens again in the future.
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nyssa
Uh there is MS VIsta on it. Sorry had to place the dig. and not very helpful. I do know of a few people who had this same problem and their only solution was to take it to a techi and do a complete wipe of the Vista and reload another Operating System. However, one of these people wound up having Vista reassert itself even after the wipe.
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pdxdavid
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pdxdavid  |  March 07, 2009 07:54 AM
Sounds like the hard drive is not seated well. I would try removing it, possibly clean it and the area with compressed air, then re-seating it. I will include a link to the pdf manual on the hp site. You will have to scroll down to hard drives and it gives instructions and pictures for removal of the hard drive.
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nis161
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nis161  |  March 10, 2009 09:36 PM
This is quite possibly a symptom of your harddrive starting to fail, when a harddrive starts to fail, there are times when sectors could still be read but hardly.

The best option here is to buy a new harddrive, but if you still want to use your current drive, I would suggest buying a copy of spinrite. The program works in trying to correct sectors of the failing drive and it does wonders to the drive. However, that is still a temporary measurement. Even if spinrite does completely fix the drive, I would recommend getting a new drive for the OS and use your current as a slave/storage drive.

A link to spinrite: http://www.grc.com/spinrite.htm
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