My MackBook, on startup, its showing the following:
They are just a bunch of vertical black and white lines, and it gets stuck there.
What could be the problem?
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It's definitely hardware. It's either the display has gone bad or your GPU (logic board) has gone bad (most likely case)
The first thing I would do is hook it up to an external monitor. If it's present there as well, then you know it's GPU/logic board related. If it goes away, then run Apple Hardware Test (AHT) to get some details. (Hold the D key while booting from a powered off state with the AC adapter connected)
Either way, you will need to take it in for service.