White screen with bars after windows logo, and loss of signal on monitor

[Cnova7]

Hello there. I bought computer around 5 years or so ago (Alienware Aurora R4 ALX, with a GTX 690 and an i73960X). I've had issues with it this past year where The monitor would turn itself off (and say no signal) particularly under heavy load, and I'd have to restart it a few times in order to stop the monitor from going off. Sometimes the PC would turn itself off after a while, but most of the time I had to do so via the power button. So as I said, after a few restarts it became stable, and there were no issues in its use. However, the past few weeks it's been occurring much more often and the performance once it is on is terrible. I usually have a stable 100fps or so while playing World of Warcraft, and that's in densely populated areas. However, the last few weeks my Fps has been dipping constantly from 100 to about 24 fps, even in low populated areas and places with lower graphical content.

Now, I turned my computer on this morning and it will now no longer go past the windows startup logo. Once the logo has appeared and it goes to load, the screen turns to a white-like colour with bars and I am unable to do anything from there.

A short while ago I'd also sometimes get a BSOD with the error of Attempted execute of non execute memory.

 

[Vic 40]

Did you ever clean the inside? Means blowing dust out the gpu too.
Did you keep an eye on driver updates and new biosses?
With 5 years passed is it maybe time to get a new psu or gpu,but look at the other things first.