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What to do if my HP 742n - Pavilion - 512 MB RAM computer won’t turn on at all?
First, ensure the power cord and all cables are securely plugged into the computer and that the power cord is plugged into a grounded outlet. Check if the outlet is working by plugging another item into it. Also, verify that the monitor is connected to the computer, plugged in, and turned on.
What to do if my keyboard doesn’t work on my HP 742n - Pavilion - 512 MB RAM Desktop, even though the computer and monitor seem to work?
The keyboard might be connected improperly. If the PC beeps repeatedly or nothing happens when you press keys, check that the cable connector pins are straight and ensure the keyboard is connected to the keyboard port, not the mouse port.
What to do if the mouse doesn’t work on my HP 742n - Pavilion - 512 MB RAM, even though everything else does?
The mouse might be connected improperly. If nothing happens when you move the mouse, check that the cable connector pins are straight (PS/2 mouse only). Make sure the mouse is connected to the mouse port, not the keyboard port.
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