This is to help you make sure you don't get YLOD
The PS3's "Safety and Support" manual clearly states that the PS3 unit to operate within temperatures of 41F - 95F
-Do not place your PS3 too close to the wall. If your PS3 is placed on a closed space, place it atleast 4-6cm away from the walls
-Usually you should not allow your PS3 to exeed 20-35F higher than the current room temperature
-Place a thermometer on the wall just behind your PS3 to prevent it from reaching high temperatures
When your PS3 encounters an overheat it usually turn's on and the power LED blinks 3 times or you will get a Yellow light blinking and then shuts down.
-If your PS3 encounters an overheat (rarely happens), put it somewhere where there's alot of airflow and away from any type of moisture. Also Windows are not recommended .
BD Failures happen when you're using a scratched up disc or over playing , I recommend not playing more than 3-4 hours at a time.
-Check your discs for anytype of smudges
-Consider buying HDD titles, sometimes to keep the usage 50-50
-when you update your PS3 firmware, always test your BD drive by playing a movie or game
I recommend cleaning your PS3 atleast once a week to prevent dust from coming in
-Use a low powered vaccum to suck out the dust out of the PS3's vents, remember to keep the vaccum atleast 2-3cm away from the PS3
-If you using a can of air, use the tube straw and let it blow from 4-6cm away from the PS3 (make sure tube is in correctly as it may fire the tube a damade your PS3) (DO NOT Spray the can upside down as it will release a freezing moisture that may damage electronics)
-If you're cleaning off the outside of your PS3 (Mainly the top and the chrome areas), use a microfibre cloth. The Playstation 3 is prone to scratch easily, typically a microfibre cloth will prevent this. NEVER use paper towels or any other paper based materieals. Including regular hand towels.
Usually when USB ports "Burn out" it's usually from using a USB hub that's sucking more power than 1 port can handle
-Equipt your USB hub with it's external power, if it's handling more than 3 ports at the time. I recommend buying a USB 2.0 hub with external power so not too much power will be used from one of the USB ports from your PS3 (Remember, some USB Hubs DO NOT have external power)
SHUT DOWN CORRECTLY:
When users of the PS3 don't have a clue to shut it down correctly, they tend to get errors
-The best way to probably shut down your PS3 is through the remote, hold the PS until you see "shut down system" and X on yes
The other was is to just push the touch sensitive pad on the PS3 until it beeps
-NEVER SHUT DOWN FLIPPING THE SWITCH FROM THE BACK when it is on (solid green LED)!
-For warrenty questions and information visit: PlayStation.com
-Or call 1-800-345-SONY to receive instructions to obtain repair/replacement services.
This information came from various sites and the manual.