The XPS-15Zs I sell are thoroughly tested. I make sure that the hardware is problem-free and the software configuration is done to my standards. Some of the steps are:
Run the built-in self-diagnosticsto ensure that all hardware components are functioning properly.
Flash theBIOSto the newest version available.
Test the batteryand replace it if necessary.I replace any battery that has less than 80% of its original capacity with a brand-new, premium-quality battery.
Do athorough inspectionandcleaning inside and outside.
Replace the palmrest and anymissingfeetor screws.
Read the Windows license code from the BIOS and store it on the desktop.
Run Windows Update.
Replace outdated device drivers, including the card reader driver.
Run PCMARK 8 Advanced Editionto make sure everything functions properly and that benchmark results meet expectations.
Run PassMark BurnInTest Professionalto make sure everything functions properly under extreme load and that there's no overheating.
Create a detailed system report on the desktop.
Create user accounts and delete testing accounts.
Install a few free application programs that I consider essential.
Install a few trial versions of application programs that I consider essential.