I was really just looking for the answer to how long should I let the hardware test go but here is some posts I made earlier so its a bit broken up;
I bought a new 15" Albook and then added RAM (2x512 sticks) I got from 18004memory.com, I had to exchange my original powerbook because of white spots so I installed those two sticks in the new one. I haven't really used the machine much with just the original RAM but one thing I noticed after I put the RAM in the old one was a lot of times the machine would not wake up from sleep and I would have to restart it. It also would seem to shutdown for no reason but it was still on the screen would get black, no pulsing light to indicate that it was sleeping, the fan would still run but I could not get any reaction to anything other than holding the power key and then restarting. and then it would also have a window come up that said in many languages something like you will have to restart your machine hold down the powerr key or press the reset button. Since switching to the new pbook it happens a lot.
I also forgot to mention before that when it does wake up from sleep the display will flash to all bule then back to normal it flashes about 3-4 times
At first I thought that it was a RAM problem but I was able to get the same resuts after I put the Apple RAM back in, as of right now I am into hour 8 and the hardware test is still going. It is on loop 23.