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I've got an IRQ problem, help please? Answered

My DVD drive won't work due to an IRQ conflict, but I can't manually re-assign the IRQ.
It's XP, and it occurred after replacing the mainboard. (The option is "grayed-out")



. If steveastrouk's suggestion of deleting the device (see Device Manager) and forcing XP to try again doesn't work, I'd try poking around in the BIOS.
.  Might be worthwhile to double-check HDD/CD/DVD jumper setting. I recommend cable select (CS) for all (E)IDE devices unless you have a reason to do otherwise.

Oh yes (tone of derision), I'll let you know, but I think you're guessing. (it is a Windows IRQ conflict)


.  Yep, I'm guessing, but it has been many years (at least 20) since I have run into an IRQ problem. Used to be quite common back in the Good Ol' Days of '286 processors and DOS, but I can't even remember what we did to straighten it out. I think we changed jumpers on cards, but that may be an overactive imagination.

Ditto, man you think these things will do it right on auto' these days...


IRQ is a bios setting...as I recall you don't change it after boot time -- thats why windows can't change it. Bios is causing the conflict.

I don't seem to have that option (I did look). The mainboard manual is on a CD... I'll try that line of enquiry though.


Other thought -- I've not seen a mobo support manually assigning irq since about the year 2000.

You *may be able to alter the IRQ map within the bios. I'm not sure otherwise. Most devices are automatic these days

I thought it said IQ for a second... I think I ought to get mine checked.

Find out what other function is using irq 14 and try disabling or reloading that. My primary IDE irq is 14 so I feel that that is correct.

It's a PCI to PCI thing, I didn't think that's a good idea because it's probably in use.


Is this a laptop or a desktop unit? I think you need to reload your system drivers. Especially since you said you just replaced the motherboard.

I've looked at 6 computers of mine and they all show irq 14 for the primary ide channel.

I can't reload them because they're on the CD (yes I did look online)


You can delete the offending one and then it will free up the irq 14 and your cd will run.

googling "irq 14" gets info that it is almost univerally dedicated to the primary ide so when the pci to pci... took it over it is surely a mistake.

Delete the device and let it try again ?

I tried that (disable) but I'l have a look at delete, and I disabled the floppy-controller (Jees-us that still was there even though I've not used a floppy for at least 10 years..) That's IRQ 6 free, but no joy...
Why is it grayed?


Disable will retain the old settings, but not use them, delete will deallocate the settings, and scan for new hardware should reallocate them in the right place. There IS still the hammer.... Steve

If the machine still functions after hammering, you could reformat the drive and install Ubuntu.

....and if Nacho's suggestion doesn't work, hit it with big hammers. ......