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Most data providers do not guarantee any order in the way they deliver features. While an apparently stable order is often a side effect of the order in which features are stored in files, one shouldn't rely on this.

Therefore I'll re-interpret the question as "how can features be rendered in a given order within QGIS".

To do this, open the layer properties, head to the Symbology tab, scroll down to the Layer rendering group box on this page, where you find a Control feature rendering order checkbox. Once this is checked, there is a A->Z button on which you can define which attribute(s) should define the sort order and if it should be in descending or ascending order.

For your case, entering "time" as sort order expression might be good. Or, if you want smaller areas on top of bigger areas, use $area.

• A no
• B see A
• C nowhere at all

PSU fans are usually sealed bearing or use solid graphite lube, and I can tell you from experience that opening up a PSU can be dangerous. You could in theory replace the fan, but it's worth spending the 30 or so dollars to buy a nice new PSU, preferably with a 120 mm fan.

You need to use Union Tool from Vector -> Geoprocessing tools -> Union. This should give you the correct topology. Or, you can use difference tool repeatedly to get the difference between big polygons and smallers polygons and finally use Merge tool to put them in one polygon shapefile.

But Union will solve the problem.