VIEWSONIC VS13329 - Manual (Page 34)

ViewSonic VNB108 28
8. A Hard Disk Drive Problem: HDD doesn’t work.
Enter the BIOS Setup utility, go to Boot menu and make sure the hard disk drive is
included in the Boot Sequence.
9. ViewBook does not respond.
In case the system is not responding, to turn off your ViewBook, press and hold the
power button for about 6 seconds. If your ViewBook still does not respond, remove
the AC adapter and the battery.
Your ViewBook might have locked when it was entering Sleep mode while performing
a communication operation. You can disable the sleep timer, if you are to leave your
ViewBook to download/upload files and will not be using it.