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[SIPfoundry] sipfoundry-3.10.1-centos5-i386.iso not bootable on some computers


Hope I am posting to the right place.

I downloaded the file sipfoundry-3.10.1-centos5-i386.iso
from http://sipxecs.sipfoundry.org/pub/sipXecs/ISO/

The discs created are considered 'not a bootable disc' by two PCs.That is to say, when the message 'press any key to boot from CD' comes up, I press the space bar, the CD starts to spin and then there is a message saying that the disc could not be booted'
My Dell D630 laptop *can* boot the CDs so I feel it may be something to do with the machines' BIOS, or the way in which the ISOs are being burned rather than the discs themselves.

I am not alone in experiencing this issue - http://www.voipplanet.com/backgrounders/article.php/3743291

I searched the site but could not see any articles or threads relating to other people solving the issue.

The troubleshooting steps I tried are as follows:

a) Checked MD5 - OK
b) Burned CD again at 10x speed - No boot
c) Tried booting another PC using the disc (2003 vintage VIA chipset)
d) Burned CD using InfraRecorder instead of Nero. I know that Ubuntu recommends this app for burning bootable ISOs
e) Installed SCSI CD-ROM drive in the target PC and attempted to boot from that. The SCSI BIOS says that there is a bootable CD in the drive but won't boot. I forget the exact message which appears after that, it scrolls off the screen. Uninstalled SCSI drive
f) Copied all the files from the CD onto my PC and used a different .ima boot floppy image. The PC did recognise the disc as bootable but got stuck in a loop loading the CD driver.
g) Confirmed that the machine can boot my WinXP install CD
h) Moved IDE CD-ROM drive from Pri Master to Sec Master.
i) Searched for Centos users with difficulties booting from CDs. All I found were people who hadn't set the boot order correctly or who had copied the ISO to the CD rather than burning it properly.

It seems to me that the BIOS & Drive are good in that they can boot other bootable discs
The downloaded ISO and burned discs are presumably good because my laptop can boot from them
More than one PC refuses to boot from the discs incl the reviewer of SIPXECS on VOIPPlanet website

The readme file in \images directory says that the boot.iso file can be used to make a bootable CD.
I can do this but don't know what to do then - there doesn't appear to be a .sh file to run to start the install process which makes sense, the CD should boot by itself.

What else can you suggest?

Peter

Hardware:

Samsung IDE CD-RW drive
Abit Intel BX chipset motherboard. Latest BIOS installed (2002 vintage)
CD-ROM set to first boot device in BIOS.

Intel Celeron 533 CPU & 640MB RAM

Nero 6 primarily used for the CD burning but also InfraRecorder one time.
Imation CDs burned at 10x & verified.