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I need to setup a XEN-Server in order to create a virtualized environment. I have successfully done this in a desktop pc but now when I installed the same in my Dell Inspiron laptop, the installation completed successfully.

However the BIOS says "OPERATING SYSTEM NOT FOUND" and I am not able to run XEN. What's more, I cannot even install any other OS into my laptop! Tried installing WinXP, Win7 and Ubuntu... No gain! I think that installing XEN has created some serious issues with my laptop's BIOS!

Can anyone please save my day?

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migrated from Apr 4 '12 at 14:45

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It could be a problem with the hard disk not being detected properly, a disk failure, or a bad MBR on sector 0. Have you tried booting off of a different hard drive? – paradd0x Apr 4 '12 at 14:57
No... How to do that? – gargie Apr 4 '12 at 15:00
Oops, you're on a laptop. It might be a bit more difficult than anticipated. Can you boot off of a USB? – paradd0x Apr 4 '12 at 15:14
Boot off after instailling or boot for installing??? XEN does not boot from usb FOR installing. – gargie Apr 4 '12 at 15:17
You mentioned that you have tried to install other OS's. Have you booted off of USB to install those? – paradd0x Apr 4 '12 at 15:21

You should set advanced options at install time.

When the Xen installer starts hit F2 and type the following:


Then use either the vim or nano text editors to modify a file.

nano /opt/xensource/installer/ or vi /opt/xensource/installer/

Change the line that reads GPT_SUPORT=True to


Save the file, quit the editor and type


at the prompt. There is a clash between the BIOS and Xen when GPT is enabled.

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