Laptop failing to run simple games

[Armoured_Badger]

My little sister like's to play Roblox on my Hp Pavilion x360 It worked perfectly , Recently There was an issue and the motherboard was replaced (By HP Not Self repair) After that nothing has worked When i try launching Roblox My Laptop Freezes And it changes from a black screen then, The game rapidly then the game crashes, My Laptop Should Run roblox Here are the Specs:
Graphics: Intel(R) UHD Graphics 620

OS: Windows 10 Home 64 Bit

Processor: Intel Core i5-8250U 160GHz

Memory: 8192MB RAM

DirectX : DirectX 12

If anyone could help it'd be great I think the Tech who repaired it may have messed something up, And if so can i use my warranty?

[sandytechy20]

@Armoured_Badger

Welcome to HP support community.

Provide the complete notebook model number or product number?

HP Pavilion x360 notebook is not designed for gaming.

Meanwhile, try these steps: 

• Go to Start Menu > click on Settings. 

• Type performance > choose Adjust the appearance and performance of Windows.  

• In the new window, go to the Visual Effects and select Adjust for best performance. 

• click Apply and ok,this should do the trick. 

If the issue persists, The best way to resolve the issue is to follow the suggestions of the HP Guided Troubleshooter:  

Click here to access it (simply select your description of the issue from the bottom of the screen to gain access to the next set of steps that should resolve your concern). 

CLICK HERE FOR MORE STEPS AND INSTRUCTIONS. 
(by the end of this document, all the issues should be resolved) 

I hope that helps.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.