Black screen buzz sound and then computer restarts

Computer Type: Laptop
System Manufacturer/Model Number: Asus K52F or Lenovo B51-80
OS: Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
CPU: i3 370M/i7 6500U
Motherboard: Asus/Lenovo
Memory: 8GB - finally :)/8GB
Graphics Card: it's an i3, dude!/dual Intel&nVidia
Sound Card: onboard
Monitor(s) Displays: 15.6" built-in
Screen Resolution: 1366x768/1920x1080
PSU: n/a
Hard Drives: 750GB Seagate internal Sundry external drives attached to other computers on the local network 1TB SSD on the Lenovo
Internet Speed: as much as I can get - usually on a dongle/phone, so <1MB/s
Browser: IE11/12/Edge/Chrome/FF(if I must)
Antivirus: MSE/Defender

Computer Type: PC/Desktop
System Manufacturer/Model Number: Asus (Custom Build)
OS: Windows 10 Pro x64
CPU: Intel Core i7 4790K @ 4.5GHz
Motherboard: Asus Maximus VII Ranger
Memory: Corsair Vengeance Pro 8GB 2133MHz
Graphics Card: EVGA GTX 980 ACX 2.0 4GB
Sound Card: Creative Sound blaster XZ
Monitor(s) Displays: Asus PG278Q ROG Swift
Screen Resolution: 2560x1440 @ 144Hz
Keyboard: Microsoft Sidewinder x4
Mouse: Perixxx Mx-2000
PSU: EVGA SuperNOVA G2 750W
Case: NZXT Switch 810
Cooling: Corsair H110 + Corsair Airflow and Static Fans on case
Hard Drives: Samsung Evo 840 256GB SSD 2TB Seagate Barracuda 7200RPM
Internet Speed: 100MB down / 6MB up
Browser: Google Chrome
Antivirus: Malware Bites CCleaner64
Other Info: Asus ROG Front Base