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

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

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Computer Hardware
A brownout is defined as:

a slightly elevated voltage lasting from seconds to minutes or more
alternating power out, power on lasting a few minutes
a slightly decreased voltage lasting from seconds to minutes or more
complete power out lasting a few minutes
has nothing to do with electricity

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