Issues with Dell U2715H monitor

When I startup my laptop the said monitor is not recognised with it's native resolution and I have to disconnect it an reconnect it to do so. Sometimes I have to repeat this process a few times. I've installed the latest Intel and NVidia drivers, but this has been going on for some time.

https://preview.redd.it/8rhiaek50ere1.png?width=358&format=png&auto=webp&s=e7aaa2990f18dac1405167eeb8f093a96196989f

I have DP1.2 enabled on the monitor, and I've also disabled it which then presents a different issue that my monitor blinks (not flickers). It actually goes off and on with a frequency of i.e. 1Hz. Black and flickering screen and black and flickering screen...

Do you think the capacitors of the PSU may be the issue or something else?