The best source for information and help is directly from the manufacturer's Tech support and warranty repair services provided by the original manufacturer.
Manufacturers Tech support is typically available 24hrs a day / 7 Days a week.
Please use the following contact numbers if you need any assistance.
Please see Manufacturer's support Pages examples listed here:
Acer: 844-433-8476 or Service@AcerRecertified.com
Asus: 1-888-678-3688 or www.service.asus.com
Dell: 1-800-624-9896 or www.support.dell.com
HP: 1-800-HP-INVENT (474-6836) www.support.hp.com