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The power nozzle refers to the beater bar located inside the bottom of the brush or the machine depending on if you have an upright or central vac unit. Lay it down or turn it over, you'll see the brush in the bottom, that's the power nozzle. Remove the cover screws and cover and replace the beater and/or belt as needed. Take images as you disassemble to make sure you get it all back in correctly.
Screws may hold the shell together but the halves are usually clipped together by hooks around the edge of the shell to discourage would be 'electricians' from doing home repairs. Once you've removed the screws and the body held by the screws doesn't come apart, look for a point where you can insert a screw driver in it to pry the body part out. If you can't do that, then don't do it. best thing to do is take it to a repair agent. At least it's safer.
The only things you could hope to upgrade in a laptop that old is the RAM and the hard drive. if it's an x86 computer the most you get get is 4GBs of ram and maybe a 250GB IDE drive in that. Laptop's are not really meant for upgrading. It isn't cost effective to upgrade laptops anyways. Spend $300 on a new low end laptop and you will have something at least twice as powerful as this laptop you currently have.
If this is a reference to a Gateway 500X series, remove the thumb screw/s from the back of the computer, on the right side. (Right side as you are facing the back of the computer) Then slide this Side Panel towards the back of the computer.
It depends on the model and processor but there may be a shiny metal bar that appears to go through the fan that is then clipped onto each side of the socket.
I there is then one side looks like it may hinge a little and what you would do is push down and away from the CPU this would release the fan so long as it was not stuck to the CPU (most are not but some are)
If you look carefully at the fan here also be small 4 black screws that may also allow you to release it.
For most coolers that would be enough and then you would just disconnect the flying lead and pop over to the nearest computer store for another one. without knowing the model of your computer or motherboard it is a little difficult to make a full assessment of what you need.
take cover off top of base.- pry off remove two screws that hold speaker unit, it will tilt out, disconnect cables and remove speaker. two screws on back of base and then take off back cover.remove sheild cover. disconnect all cables. 4 screws hold power supply in. rca connector board has little black button holding it on. pry up and then remove board to access connecters behind. pull all cables out towards you. remove 6 screws that hold base to back of screen, pull up tape under where cables go thru hole. remove base from screen. take out screws on back of screen. carefully pry all around case to seperate. remove back, and then sheild. there are a few screws that hold it on. If your screen was black, then the two inverter boards could be the problem. there is one in the upper left corner and one in the lower left corner. you can by them on internet. match the partnumber, there are 2 diffent ones.