No Signal, Monitor loses Input, Bluescreen and blackscreen with audio

[Hustii]

So this is my system:

Ryzen 5 3600
B450M Tomahawk by MSi
2x3200 Dual 16 Kit from Vengeance
Sapphire Pulse RX 5700 XT

Problem is the following:

1. Starting the PC either results in 50% "No Signal" or 50% Startup with various speed to homescreen
2. When doing 2 things at once - e.g. Youtube playing and starting up a game, PC can freeze, audiostutter, lose signal and play audio etc.
3. I have run Benchmarks and Windows 10 RAM-Diagnostics but nothing seemed to be out of the ordinary.
4. Monitor is not the problem, I tried multiple once with different Input-variants
5. Games like Tomb Raider used to run flawless, now it sometimes just wont load and I can't even manage to enter task-manager
6. I can only play fortnite fairly smoothly - SO HELP IS REALLY NEEDED

My guess is defective RAM. I will be sending in my Dual Kit to my vendor, since I have a service level gold attached to by order from back when, so replacement should be easy.
Any other guesses or fixes are always welcome!

[Praesi]

To make sure RAM isnt the issue, you should run memtest at least several hours.

[Hustii]

i tried setting up memtest88 or whatever it is called, but I am just to stupid to get it to work I guess.

[Hustii]

23 hours ago, Praesi said:

To make sure RAM isnt the issue, you should run memtest at least several hours.

I ran memtest 2 times, the whole 4x14 tests. No issues. What now? Defective mobo?
What else should I test to see what exactly is causing this weird mix of problems?

[Praesi]

20 minutes ago, Hustii said:

I ran memtest 2 times, the whole 4x14 tests. No issues. What now? Defective mobo?
What else should I test to see what exactly is causing this weird mix of problems?

I douibt its a mobo Problem. Possible, yes. But unllikely. In your case i would simply reinstall windows. Could be a software Problem.

[Hustii]

Alright, i will give that a try.