The causes from a meltdown are due to overheating/overpowering of the main power source
By melting
Melting causes an igneous rock to form into lava/magma.
because of sun
the melting of ice or glaciers
~ BY MELTING, THAT CAUSES FLOODS~
Starch does not have a specific melting point because it undergoes thermal decomposition before melting. Instead of melting, starch will break down into simpler compounds when heated to high temperatures.
The salt causes a chemical change in the ice changing the melting point of the it and causes it to thaw, preventing customers form slipping over.
Snow and ice melting in warmer months is what causes waterfalls on mountains.
Melting Glaciers
When sugar caramelizes on being heated above its melting point, it undergoes a chemical change. This is because the heat causes the sugar molecules to break down and rearrange into new compounds, resulting in the formation of caramel.
Vaseline is made primarily of hydrocarbons, which have low melting points. When exposed to heat, the hydrocarbons in Vaseline begin to melt and transition from a solid to a liquid state. This process is known as melting point depression, where increased temperature causes the substance to break down and become less structured, leading to its melting.
You likely answered this yourself - heat = melting, so your system isn't being cooled down enough. Your computer should have shut down long before that to prevent damage and safety measures.