Need help with bizarre problem (1st build)

[Bumpy master]

Hello guys,

So, i made my first ever build this november, and i recently made the decision to swap psu's, i got a corsair tx750m 80 plus Gold, because i got a rx Sapphire PULSE RX Vega 56, and it says recomended wattage to be 750W, i was able to start the computer and everything seems fine, i install latest drivers for my pc with ''drivers easy'' software, and still everything seems fine, i run a benchmark test with heaven benchmark 4.0 from unigine, and i get 68C degrees max after a while (20 mins) meanwhile the hbm temp is at 75c, and fan speed only goes at 33% max, and got some drops in core clock (from 1535~ not constant to 1400 for example) and it did dropped some frames, but nothing from the other world, now the problem is when i was trying to play league of legends (way less intense i assume) and stream, and after like 5-10 mins of gaming my monitor flashes black for like 2 seconds, and then shows image again, and it happened like 5 times more.. It's very annoying and after i took the stream down, it stopped happening, and it's weird because i also opened core temps software that indicated that cpu temp was only max 56c, and gpu was at max 45.. and im very scared because i've spend all my budget already on this computer, and i don't know what to do, what do you guys think? is it a cpu overheating problem? or a gpu problem? im very scared so thanks in advance.

By the way my full specs are:

-Ryzen 5 2600 with stock cooler non oc, runs at 1.208V with 3.4-3.7 ghz

-Sapphire PULSE RX Vega 56

-Aegis 2x8GB ram 3000mhz oced to 2933 with xpm profile from msi gaming plus motherboard 

-Msi gaming plus x370 motherboard

-250gb samsung evo 860 sdd

-corsair tx750m

-koolink rgb case

-hp 25x gaming monitor at 144 hz non oc, at 1ms with amd freesync always on.

If you could be so kind as to help me i'll be eternally grateful, i'm really loving pc building, and i loved to build my first one, but i would hate it for it to become a disaster.

Ps. By the way i am running windows at ''high performance'' energy profile, and i also am using an old keyboard as i wasn't able to get a new one yet, it's an old acer (6-7 years) that came with my old pre rig. Thanks again.

[DailyProcrastinator]

Didn't read all of it but all I can say is that CPU temps at 56C and GPU temps at 45C is very low. If you aren't seeing 85+C you are all good, even at 80C you won't damage components just prolonged use at those temps is not recommended. 

[homeap5]

Try to change monitor cable.

[dgsddfgdfhgs]

22 minutes ago, Bumpy master said:

and it's weird because i also opened core temps software that indicated that cpu temp was only max 56c, and gpu was at max 45

gpu temp looks too good to be true!

what the gpu usage and temps at gaming when screens shuts down? this may give us more clue 

[Z3R0 CHANC3]

Mysterious.   Update your bios if there's an update.  If not, re-load defaults on the bios.  

[Bumpy master]

25 minutes ago, homeap5 said:

Try to change monitor cable.

I will try to change to display port as soon as i get one.

19 minutes ago, dgsddfgdfhgs said:

gpu temp looks too good to be true!

what the gpu usage and temps at gaming when screens shuts down? this may give us more clue 

gpu usage was at around 75-80% at time of screen flash and temp was 45c and hbm ram temp was at 75c, cpu was at 47.6c, that's why im so confused those don't seem like temps that would make it shut down, the weird thing is it says that fan speed and usage is 0 at all time..as u can see below, maybe a faulty gpu? i hope its just a cable issue, ill try to buy a display port 1.2 tomorow and check it, i hope gpu its fine, i got it on black friday and was a good deal..

 

16 minutes ago, Z3R0 CHANC3 said:

Mysterious.   Update your bios if there's an update.  If not, re-load defaults on the bios.  

thanks i will try that