Dell press F12
HP Press F2 or Esc to enter the Startup Menu, then select System Diagnostics
Lenovo: Press F10 or use the Novo Button (a small pinhole button near the power button)
Acer: Press F2 or F12
ASUS: Press F9 or Esc
Toshiba: Press F2 or F12
Look for hardware / fan test & run
Dell press F12
HP Press F2 or Esc to enter the Startup Menu, then select System Diagnostics
Lenovo: Press F10 or use the Novo Button (a small pinhole button near the power button)
Acer: Press F2 or F12
ASUS: Press F9 or Esc
Toshiba: Press F2 or F12
Look for hardware / fan test & run