Selling a computer safely requires a verified backup, account removal, secure erasure, a clean operating-system setup, and honest disclosure of condition.
What this usually means
A useful backup plan identifies the files that matter, keeps an independent copy, and verifies that representative files can actually be restored. Synchronization alone may also copy deletions or damaged files.
Practical checks and decisions
Copy and open important files on another device
For “copy and open important files on another device,” identify the only original copy before changing the computer. When the storage is stable, make an independent copy and open several representative files so a sync icon is not mistaken for a verified backup.
Remove personal accounts, licenses, and saved browser information
Use “remove personal accounts, licenses, and saved browser information” as a verification step, not a quick password swap. Choose a unique credential, remove recovery details you do not recognize, sign out other sessions, and record which accounts still depend on the same email address or phone number.
Reset or erase the correct drive using a suitable method
Before “reset or erase the correct drive using a suitable method,” write down what matters most and where it currently lives. That inventory keeps photos, documents, browser exports, email archives, and application data from being overlooked during how to prepare your computer before selling it.
Confirm the buyer receives no passwords or private recovery details
After “confirm the buyer receives no passwords or private recovery details,” watch for new login alerts, password-reset messages, sent mail, and changed account rules. Those clues help determine whether the concern ended with one login or requires a wider account review for how to prepare your computer before selling it.
When a professional diagnosis makes sense
Professional diagnosis is useful when the same symptom returns, important work or files are interrupted, the computer cannot start reliably, or the next test would involve parts, resets, unfamiliar commands, or changes you cannot easily reverse. Bring the exact messages and a short history of what changed before how to prepare your computer before selling it became a concern.
For hands-on or remote help, review the related service, or browse the Help Center for another guide.
