How to Do a ATX Reset
If you have any issues with your notebook or desktop computer, you should first phone the help line and explain your problem in detail. However, except cases where the problem is obvious, they will usually ask you to do an ATX reset. This usually solves power issues by resetting the power supply in your notebook or desktop computer. Performing an ATX reset is relatively easy and almost anyone can do it. Here is how you do an ATX reset.
Desktop computer ATX reset
Shut down the computer and disconnect all external devices including the keyboard mouse.
Unplug the power cord.
Press the "Power" button and hold it for at least 15 seconds.
Reconnect the power cord but do not reconnect the external devices yet.
Turn on your computer and see if it boots normally. If it does, shut it down, reconnect the external devices and turn it back on.
Notebook ATX reset
Disconnect all external devices including keyboard and mouse and unplug the power adapter from the notebook.
Remove the battery from the notebook by following the instructions found in its user manual and hold the "Power" button for at least 15 seconds.
Reconnect the power adapter to your notebook but do not reconnect the external devices yet. Turn your notebook on and see if the power LED lights up. If it does, test if the notebook boots normally.