Notice that this video is only for one the many possible device malfunctions! Check the link for PS2 repair needs. I had a look and found it convincing. There is apparently some difference between versions of older PS2 models as well. http://secondchancecritic.com/freestuff/ps2repairguide/ Find other solutions elsewhere in the web if these don't suit your needs.
PAY ATTENTION TO THE FACT when PLUGGED IN there's an ELECTRONIC CURRENT flowing inside the machine, therefore unplug the PS2 every time you're about to tamper with the insides. Ground yourself just in case when working with electronics...
This video is an easy how-to-fix tutorial for PS2 disc read error.
What your are going to need? An old version Ps2 aka the Fat one. Adjustable screwdriver. Canned air. Some PS2 games, blue and silver discs; a DVD and a CD. If you have PSOne games, it's good to test them as well.
Don't have to worry about warranty any more, since they don't make any these I believe. Before starting, remove any stickers.
Remember there's a class "burn eyes to hell" laser inside, so you want probably take that into consideration.
Here is a good set of instructions I found (http://www.ehow.com/how_8581914_fix-ticking-ps2.html):
1. Turn the PS2 over and use a slotted screwdriver to remove the square rubber and plastic tabs covering the screws. Remove the screws under each tab with a Phillips screwdriver. Take note of where each screw came from as these screws must be reassembled in the correct order. (Some bigger than others)
2. Lift the bottom cover away from the PS2 and set it aside. Flip the console over and slide the top cover forward. Lift the cover carefully away from the unit. Do not pull or tug on the ribbon connecting the "Power" and "Eject" buttons on the cover to the rest of the console.
3. Use a jeweler's screwdriver to remove the four screws holding the loading tray cover in place. Carefully lift the cover away from the loading tray and set it aside. Use compressed air to remove any dust or debris from the innards of the PS2.
4. Plug the PS2 into a power outlet and turn on the console. Press the "Eject" button to slide the loading tray forward and unplug the PS2 immediately afterward.
5. Locate the white gear behind the PS2's laser assembly. This gear is used to adjust the height of the PS2's laser lens. Mark the current position of the lens on the silver plate next to the gear and on the gear itself. Carefully turn the gear counterclockwise until the lens drops to the bottom.
6. Place a blue-coated PS2 disc in the loading tray and use a paperweight to hold the loading tray cover the assembly. Connect the PS2 to your television and turn it on. Turn on the PS2 and press "X" to access the browser.
7. Wait for the PS2 to read and load the contents of the disc. If the console fails to read the disc, open the loading tray, turn the PS2 off and remove the loading-tray cover. Use the gear to raise the laser lens height by one notch and repeat the procedure until the console reads the disc.
8. Place the cover over the loading tray and reinsert the four screws used to hold it in place. Replace the top and bottom covers on the PS2 and reinsert the screws in the correct order.
PS. The Mario Song is from Super Smash Bros. Melee - Title -- Ending (Super Mario World) by Shota Kageyama
