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Following Barry Watzman post goes right at the answer for that OP.
Taking what he has posted one step farther. When load increases too
much (per Barry's test), then power supply voltage will drop
significantly. But only if the power supply is undersized. Barry's
full power test combined with voltage reading will answer the OP's
power question. An undersized supply (that may create future
problems) will boot a computer just fine. But the answer to that OP
question is found in voltages as load increases to maximum - Barry's
'multitasking to everything' test..

Just because others have used alternative supplies without problem
does not say this supply is sufficient for this computer. But a 30
second measurement will answer the question without speculation.

Undersized power supply will not harm hardware (as per Barry's post
including that UL reference). But future unexpected shutdowns can be
avoided by a simple voltage measurement.

On Feb 18, 1:31*am, Barry Watzman <WatzmanNOS...@neo.rr.com> wrote:
> It's unlikely to be dangerous. *The power supply should shut down if an
> attempt is made to draw too much power (the alternative would be to
> overheat to the point of being a fire hazard, but I'll assume it's a UL
> certified supply). *However, the only time the laptop would draw it's
> max load would be if it was doing EVERYTHING at once .... charging the
> battery, running a worst case CPU load, burning an optical media,
> running a max load peripheral on every USB port, accessing the hard
> drive with a worst case seek pattern .... all at once. *The reality is
> that most laptops draw far less than their rated power requirement (like
> half), AND most power supplies can put out more than their rated load
> (at least 10% to 25% more). *So while it's not a good idea ... the
> supply may run hot ... it's not truly dangerous, either.
>
>
>
> Drew wrote:
> > Hi Gang:
>
> > On a friend's Compaq notebook that calls for a 90W power adapter (the
> > AC Adapter connector has 90W labeled above it), he is using an HP AC
> > Adapter that is 75W.
>
> > Is this safe to do or could it damage the notebook? *I wasn't sure
> > since the wattage on the power supply is lower than what the notebook
> > wants?
>
> > Is this safe or a big no no?
>
> > Drew- Hide quoted text -
>
> - Show quoted text -