Slack installed without errors, but clicking it does nothing? The app is usually running invisibly, or a graphics issue is stopping the window from appearing. Here is how to get it back.
The usual culprits are: Slack is already minimised to the system tray, a previous Slack process is stuck in memory and blocking a new one, the window opened off-screen, or an outdated GPU driver prevents the interface from rendering.
Look at the bottom-right of the taskbar (click the "^" to show hidden icons). If a Slack icon is there, Slack is already running — click it to bring the window forward.
Open Task Manager (Ctrl+Shift+Esc), find any Slack entries, and end them. Then launch Slack again from the Start menu — a fresh process often opens normally.
If Slack is running but invisible, select it and press Win+Shift+Left or Win+Shift+Right arrow to pull the window back onto your main display.
Slack's interface uses GPU acceleration. An outdated driver can leave the window blank or stop it opening. Update your GPU driver, then restart and try again.
Right-click Slack and choose "Run as administrator". If it still won't open, end all Slack processes, restart Windows and reinstall a fresh copy — your account and history are safe in the cloud.
Usually Slack is already running in the system tray, a previous process is stuck, or a graphics-driver issue stops the window from drawing. Checking the tray, ending stuck processes and updating your GPU driver resolves most cases.
Click the Slack icon in the system tray to restore it. If the window opened off-screen, select it and press Win+Shift+Left or Right arrow to move it back onto your display.
End all Slack processes in Task Manager, restart your computer, then reinstall a fresh copy from the official site. Because your messages live in the cloud, reinstalling does not lose your account or history.
Download the official Slack installer and reinstall cleanly.