Actions or damage that cause physical harm, use of unapproved non-Dell parts that lead to a failure, or unauthorized modifications will void a Dell warranty for that specific damage. 

Physical Damage: Drops, cracks, crushed chassis, or liquid spills caused by accidents or misuse. 

Damaging Upgrades: While replacing user-accessible parts like RAM or storage is generally allowed, breaking a component during the installation or using faulty third-party hardware that directly damages the system will void coverage for that issue. 

Extreme Modifications: Overclocking, modifying the BIOS or firmware, or undervolting components if it causes permanent hardware stress or failure. 

Unauthorized Repairs: Service or disassembly performed by anyone outside of Dell-authorized providers that results in internal damage.

Tag Tampering: Removing, altering, or defacing the service tag or serial number label