sounds like a wire's just loose
There are usually only two problems upgrading any OS, a performance hit on older computers and the problem of upgrading any applications or hardware drivers that won't work in the newer version. The biggest problem is having to upgrade most or at least some of your programs/games. With these two older sytems the maufacturers should have upgraded versions out by now. Another problem is if the manufacturers just stop upgrading drivers or software. 3rd party hardware drivers or software like printer drivers are a problem sometimes as they will only update the drivers for so long before they just drop support completely. If your computer came brand new with 10.5 then there won't be any problems with the computer it self as far as taking a performance hit. If the computer is a few years old then it may get to a point where it actually slows down. Upgraded operating systems are usually written for the next newer computer coming out to optimise the hardware better. Thats why Apple has a limit on suporting older computers to a certain point so they run the best.
A basic problem is, when your Computer first stabled itself, (when you first bought it) it enables itself a Security System, which basically runs the whole thing, and when you turn it on, it switches on this TINY circuit which runs the computer, and sometimes when this circuit is disabled or faulty, it will automatically turn off, and so will the computer.
Usually restarting your computer can help. If the problem is network or Internet related you can try restarting your router.If you have a problem with computer drivers (eg. the printer, mouse, keyboard, etc.) you can try starting windows in safe mode. (See related questions for help on this)If you can't get an Internet connection, you could try ringing your ISP.
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