Step-by-steps:
1. First of all, unplug all the cables connected to the computer.
2. Open the CPU casing cover and pay close attention to whether there is a detached component, which scorched cable / disconnected, or signs of damage to other components.
3. When all components are installed correctly and there are no signs of physical damage to hardware, remove the RAM and clean the connectors (the yellow metal in the bottom of RAM) using a pencil eraser, then wipe with fine brushes.
4. Remove the VGA card and clean the connectors such as connector cleaning RAM earlier, using a pencil eraser and cleaned brushes wear smooth. Clean the connectors and connector VGA RAM Card in Mainbord with fine brushes while in inflatable-blow that dust and fine dirt clean. (if the computer buddy just use VGA on board skip this section)
5. Remove the cables connected to the mainboard and hard drive, wipe all of its connector and insert it correctly.
6. When everything is clean replace the RAM and VGA in place correctly. Attention! when my friend installed RAM is less fit / tilt / no entry part, this will lead to faulty RAM, so the installation of RAM, VGA, or other components should be properly addressed to avoid things that are not desirable.
7. The final step is the cap back CPU casing cover and reattach all cables, turn on the computer and try to mate. Usually the computer immediately and go back to normal life
8. Good Luck
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