Computer Hardware
An IRQ allow interface cards to:

Interrupt the CPU to request service
Pass data to the CPU to be processed
Pass data from one card to another
Pass data to the computers memory

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Computer Hardware
Suppose that you have a the maintenance package identifies several possible field replaceable units (FRUs) that will resolve the problem. What should you do after turning the power off?

None of these
Follow the same procedure as in ays replace the system board first if it is on the list of possible FRUs If multiple FRUs are indicated, then software is the most likely source of the problem
Replace the indicated parts, one at a time in the recommended sequence, until the problem is resolved; return unused FRUs to stock
Replace all of the indicated FRUs at once and return the machine to the customer if the problem is resolved

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Computer Hardware
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:

I/O addresses cannot conflict
software tends to mess up IRQs
the BIOS sometimes has more of a problem controlling IRQs
software tends to correct I/O conflicts
there are a lot more I/O addresses than IRQs.

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