Windows 10: How to get to the cmd screen

I am trying to get to the safe mode on my grandsons HP Stream due to fact he has forgotten his log on password and we cannot figure out how to get to where we can get in there and change it without knowing the one that we don't know. Any idea's... I have even looked for a way to factory reset the whole computer but nope cannot do that either... this is just stupid...

:)

 

Overclocking / Undervolting guide for Vega 56 or 64?

Here's a quick laundry list:

List of software to use for overclocking and testing
Examples:
Wattman (and how to find and use it, like an overview, including profiles)
Unigine Valley or Heaven (use this for quick testing while changing settings in Wattman and checking for stability / artifacts) ...just suggesting this
How to monitor cores / mem speeds and temps during testing (I've seen screen overlays, and others using GPUz)

Step-by step overclocking in Wattman
Fan speeds
Power limit
Temp limit
Voltages
Core speeds
Memory speeds

 

Windows and CMD- renaming a file in CMD

Steps I've done

Here what happens

• 
  turn on PC
  
• 
  start windows
  
• 
  get blue screen ( message NTFS file)
  
• 
  it reboots returns to diagnosing PC
  
• 
  Diagnose and repair fails
  
• 
  I move to advance options
  
• 
  will not reset windows , I click on CMD
  

things I've tried
commands:

reagentc /disable

reagentc /enable

*************************FAILED
not recognized
**********************************

Please advise

• 
  

 

Laptop with broken screen How much?

I would like suggestions and look in local stores. I dont wanna buy a laptop from someone online. Sorry. But could be a good idea if you asked him about the performance on older games. Gonna make a list ofall laptops people suggest me.

Remove the screen for space purpose here its small desk and if the screen is opened it will hide my 22 inches lcd