Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to fix computer overheating caused by blocked heat sink [title] Unplug your computer before opening the case. [step] Wear a static wrist guard if possible, or touch the metal case before handling anything inside, to ground any static charge you may have. [title] Consider other options first.

Ending1: [step] If your router itself is misproperly plugged into the wall, the plug could have bypassed the router and burned through the wall. If this error instead worked, then the light bulb may still be coming on when all the power is turned up. Ending2: [step] Depending on the project you are working on, it might require you to disconnect, suspend or unplug the water line from your power supply before opening it. It may suggest that that your ports should be replaced even though you don't see specific instructions. Ending3: [step] If you've sought the advice of a circuit tester, your computer can have very low heating, and even if you don't completely understand the problem, take many steps before determining this. Find the main hot point relative to the heaters using the " do not touch " selection box and continually check your progress. Ending4: [step] Overheating issues are also often caused by poor air circulation in the computer case. If you have space, adding another fan can help.

Answer format: ending1/ending2/ending3/ending4