Re: "No OS found" AND "CPU Fan failed" message (156 Views)
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Occasional Visitor
Christian Sandlass
Posts: 1
Registered: ‎09-12-2004
Message 1 of 4 (156 Views)

"No OS found" AND "CPU Fan failed" message

This morning my HP Pavillion 505n gave me this message: "No Operating System found". I tried restarting several times without success. I also tried entering the BIOS to check for the HDD. I was able to press F1 and the BIOS asked me for my password. Unfortunalety i couldnt remember the password i used maybe 2 years ago.
To clear the Bios i pulled out the battery and put it back in. Now when i start my PC it tells me the "CPU FAN failed" and i need to get it serviced. With F2 i am supposed to be able to resume boot. BUT neither pressing F1 or F2 works cause about 2 seconds after the message gets displayed the PC shuts down again. So now i cant even get into the BIOS which worked before i tried to reset it.
How can i resolve this issue ? Any other way to reset the BIOS than pulling the battery out ? Could the battery be the problem ? Any suggestions would be great !
Thanks in advance
Chris
Frequent Advisor
Chris Berwald
Posts: 64
Registered: ‎05-18-2005
Message 2 of 4 (156 Views)

Re: "No OS found" AND "CPU Fan failed" message

It sounds to me like a heat issue. Did you by any chance accidentally disconnect the CPU fan while you were in your computer? If it is still connect to the motherboard and the fan is still not spinning then all you have to do is replace it (CPU fans usually don't cost very much).
Respected Contributor
Venkatesh_16
Posts: 227
Registered: ‎03-26-2005
Message 3 of 4 (156 Views)

Re: "No OS found" AND "CPU Fan failed" message

Hi there,

If the CPU fan cable connections are okay and you contine to receive the error message try these steps:

1. Restart the computer and press F1 when blue HP logo appears.
2. Goto Advanced menu, select Hardware Monitor and hit Enter
3. Select CPU Fan check and hit Enter.
4. Choose Disabled option using up and down arrow keys.
5. Select System Fan check and hit Enter.
6. Choose Disabled option using up and down arrow keys.
7. Press F10 on the keyboard and Y. Then hit Enter.
8. Now system will boot to Windows.
9. Again shutdown the computer using power button.
10. Then, Turn-On the computer.

HTH
Venkatesh
Respected Contributor
Venkatesh_16
Posts: 227
Registered: ‎03-26-2005
Message 4 of 4 (156 Views)

Re: "No OS found" AND "CPU Fan failed" message

Hi there,

If the CPU fan cable connections are okay and you contine to receive the error message try these steps:

1. Restart the computer and press F1 when blue HP logo appears.
2. Goto Advanced menu, select Hardware Monitor and hit Enter
3. Select CPU Fan check and hit Enter.
4. Choose Disabled option using up and down arrow keys.
5. Select System Fan check and hit Enter.
6. Choose Disabled option using up and down arrow keys.
7. Press F10 on the keyboard and Y. Then hit Enter.
8. Now system will boot to Windows.
9. Again shutdown the computer using power button.
10. Then, Turn-On the computer.

To troubleshoot the "Operating System Not Found," or "Invalid Media Type" error, follow these steps:

1. Check that the floppy and CD/DVD drives and all slots of the memory card reader are empty. Remove any floppy disks, optical disks, or memory cards that are found. Restart the computer.
2. If the error persists, verify that the hard drive is detected in BIOS:

a. To enter the BIOS, press the F10 or F2 key, repeatedly, at the logo screen.
b. Look at the Main menu. If the BIOS detects the hard drive, it appears under Primary Master.

3. If the hard drive is detected, press F10 and then press ENTER to exit the BIOS setup.

If the hard drive is not detected, follow these steps:

1. If the computer is on, turn off the computer.
2. Open the computer case by removing the side panels and/or cover.
3. Disconnect the hard drive power and IDE cable.
4. Turn on the computer and wait until an error message appears.
5. Turn off the computer, and reconnect the cables.
6. Turn on the computer.

Windows should now start without the error.


HTH
Venkatesh
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