Dell refuses to boot from CD
I'm working on a Dell Dimension 3000. It has two IDE optical drives, one DVD-ROM/CD-ROM Combo drive and one CD-RW drive on the secondary IDE channel. It has an IDE HDD on the primary IDE channel.
The computer in question was brought to me with a massive malware infection, including Advanced Antivirus, zlob, virtumonde, sony rootkit, and some new and as of yet unidentified bundle of fun that restricts all system access policies, all of this a mere 2 days after I had cleaned it up and handed it back to them spyware-free, but I digress...
The point is, in order to clean some of these infections, I need to boot to an alternate OS and nuke them from orbit, but the computer won't boot to a CD in either of the optical drives.
I know the drives work; I can see the media in both of them when it's booted into Windows in safemode with command prompt. I also know the CDs work. I have tried a memtest disc, a drive fitness test disc, and an ultimate boot CD, all of which work fine on other computers.
The BIS sees both optical drives and lists them as CD-ROM drives on the secondary master and slave IDE devices, although it only shows one "IDE CD-ROM Device" along with the HDD in the boot order. The CD-ROM device is listed before the HDD.
I've tried disabling the HDD altogether from the boot order, but that only results in a boot error, OS not found. I tried changing around the primary and secondary IDE channels, also no results. It just boots directly into Windows on the HDD, regardless of selected boot order, even when specified explicitly in the boot options selection screen.
I've also tried resetting the BIOS, pulling out the CMOS battery, still no dice.
Any idea why this machine won't boot from the optical drives, or how I can fix it?
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