Inspiron 3521 won't start up

My laptop will only start up maybe 1 in 5 times at the moment.

When it doesn't work, it gets stuck before the dell splash screen with what sounds like a 'fizzing' or 'popping' sound every 3 seconds (It's not the usual bios beep codes) that will keep going for as long as I leave the laptop on. It it does start up okay, there are no errors and it boots into windows fine.

I've run the bios diagnostics (on one of the few occasions I could get to that stage) and it didn't find any faults.

Is this a system board failure? Or something I might be able to troubleshoot further?

Many thanks.

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