[Ti] Loss of AC power

[Kynan Shook]

The usual thing that happens with these is the power plug breaks inside 
the computer.  If you plug it in and can wiggle the plug more than just 
a very, very small amount, there's a good chance it broke.  It is 
possible that the power adapter itself is broken, but very unlikely.
Even more unlikely is that your power manager just needs a reset, but 
it's worth a try.  Different models do this differently; some have the 
reset button on the back, some under the keyboard by the power button 
(a little silver and gold button), and some use the key combo 
Control-Option-Shift-Power.  No matter which one you need to use for 
your computer (check Apple's support page), shut it down first.

Also to note: more recent power adapters (starting with about the 65 
Watt ones, I believe) do have a protection circuit built in; if 
something like a refrigerator is on the same circuit, the power adapter 
may shut itself off to protect the computer.  In this case, the power 
adapter must be unplugged from the wall to reset it.  The only way to 
prevent this is to find a circuit that does not have a large load on 
it, or to use a UPS or similar device that is capable of correcting 
over and under-voltage (preferably without going to battery backup to 
do so).

"Loren Schooley" <loren at flash.net> writes:
> I am diagnosing a Ti 550 that won't power up any longer since the 
> battery
> has been exhausted. When I plug in the power cord the AC plug light 
> does not
> illuminate amber or green or anything. I put a volt meter on the power
> supply and it read about 3.1v.
>
> Could it be the power supply unit, or the board? It does work with a
> battery. Perhaps there is a AC power reset for protection somewhere 
> inside?