Usually this problem is caused by what we call a stuck hardrive. The hardrive is not spinning and sticking. Alot of factors cause this, high impact damaging internal components. Dents (biggest cause) causing the harddrive to stop.
Opening it up and closing it again will work BUT its only temporary, you've caused the damage it will stick again after a few days, also the screws are very weak. A manufacturer trick to stop people fixing them themselves =p, so you need to fix it permanently first time you open it.
Firstly remove the back cover to reveal the hardrive. you then remove ALL dents from the back cover, even if they're small, they were never built to work with any sort of dent I'm afraid, just do it as best you can. the next step is unsticking the hardrive. This is quite difficult because if you cause any damage here you'll ruin the whole thing, we have really expensive equipment to do this so I'm going to go through this with a household item.
You'll need an antistatic cloth, the kind you use to dust furniture. First check the reader, the thing over the spinning disc, this should not move, well it can just not alot, it shouldnt move down onto the disk. If it does, you may have to solder or whatever to repair it, for this you'll need someone who knows what they're doing, this is rare though since the case would prevent this unless you're throwing it off buildings or something. After this is checked, nudge the hardisk(spinning circle) Nudge VERY VERY lightly, you want it to spin a little just to unstick it, do not force it. do not press it down, you scratch it and you'll ruin it for good.
Once its moved a little, depending on how the head is placed it might stop on its on if they're closed, forcing it passed this will damage the heads and cause it to spin uncontrollably. you get the idea you're just unsticking it, one rotation of it will do.
Re-essemble. Will work fine, if you left it stuck on the screen, there is a reset button, its a small hole, put something in it and it will reset it, i think theres two small holes on this model, we don't make it anymore and warranties have expired so forgive me for not knowing everything. One hole will do bugger all, the other will reset it.
Hope this helps you all out.
Dan Smith - Creative Labs Technician., August 2008