The same as any modern car, i.e. when the engine is not running, 12v power is supplied by the vehicle battery, but with the engine running, 12v power is supplied by the alternator.
No you can buy a supply seperate but the case always has a supply.
No, tower cases do not always come with a power supply. Sometimes they come with a standard one, but many people prefer to choose their own.
1999
Yes
Yes
Laptop power supplies generally come from their manufacturer. So HP power supplies would come from Hewlett Packard, and IBM power supplies would come from IBM.
No, unless you have bought it with a bundle.
A temporary fault in the supply
The Cooler Master Storm Scout doesn't come with a power supply. You'll have to buy your own.
12 May 1999
In 1999
The power supplied by a three-phase supply, or any supply come to that, is determined by the LOAD, and not by the supply. So you must look at the data provided on the equipment's nameplate to find out what its power rating is.