15
WHY
IS MY DESKTOP
COMPUTER NOT
TURNING ON?
Unlike laptops, desktop computers don’t have batteries that can run
down, so a complete failure to even turn on is not a great sign.
We’re talking about a PC exhibiting no signs of life – if you’re
seeing something on screen, hearing weird beeps, or you’re getting
bewildering error messages, we’ll deal with those later. Right now,
we’re focusing on a computer that’s to all intents and purposes dead.
16
First thing to check is that all the
power cords are plugged in
securely. Desktop PCs will often have a kettle-plug type socket that
fits into the back of the computer – just make sure that hasn’t come
even slightly dislodged, as that can prevent a PC from starting.
Also try unplugging
peripherals such as printers, scanners, USB
hubs, or any other device other than keyboard, mouse, and screen.
An electrical fault with one device can prevent a PC from booting.
If
that fails to bring it to life, then there may be a problem with
the computer’s power supply. If the
PC case has been banged or
knocked, it’s possible the cable(s) connecting the power supply to
the computer’s motherboard has come loose.
If you feel comfortable opening up your PC and having a poke
around, you’re normally looking for white plastic connectors that have
popped off the motherboard (the main circuit board).
Every power
supply is different, but search YouTube for ‘replacing
a PC power
supply’ and you’ll find videos that show you how they plug in. If you’re
not confident, take it to a repair shop – it should be a cheap fix if it’s
just a loose cable.
Power supplies themselves can fail, and this is normally a job for
the repair shop unless you’re very confident you know what you’re
doing. If you’re planning to replace the supply yourself, just beware
that all power supplies are not born equal – you’ll need to match
the wattage of the supply you’re replacing. It’s very much at your
own risk.
Other internal devices such as memory modules or graphics cards
becoming unseated can prevent a computer from firing up. A gentle
