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Computer makes a beeping sound when switched on, the CPU and motherboard fans start , but there is no display on the monitor. Even after restarting the same problem occurs.

Fix it: Try to find the cause of  the error . When a computer is switched on , the hardware runs a power on self test (POST).  If any errors in the hardware are detected in this test, they are  indicated by  audio beeps or  an error code is displayed on the screen. The sequence of  beeps and error codes vary according to the manufacturer of the motherboard and should be noted down for troubleshooting the problem.

Power on self test beep codes  

Beep codes and diagnostics for Award BIOS

American Megatrends (AMI) and Phoenix beep error codes

.You are more likely to face this error , when you have not used the computer for a month or so, especially after the monsoon. In such cases, you can fix the problem yourself, instead of calling an expensive (and often unreliable) computer technician

1. Remove all the connectors for the mouse, keyboard, display and power cable from the CPU. Then remove the cover of  the CPU. For most models of  Compaq Presario/HP desktops, there is a single knob like screw, which can be easily removed by hand, even without a screwdriver. For assembled computer the layout may make troubleshooting difficult.

2. If you have not used the computer for a long time, there is likely to be a lot of dust on the motherboard. Remove the dust using compressed air. This is recommended by most troubleshooting guides on the internet , but compressed air is  not available in most hardware stores in other countries. Instead, use a thick  paintbrush , the kind used in painting classes taught in school . It will cost about Rs 15 and is available at most bookshops. The CPU and power supply fan will have the most dust.

3. After removing all the dust, plug back all the connectors and restart the computer. If  the beeping sound persists, open up the computer again. Check if all the dust is removed.

4. Remove the RAM  from the memory slot, remove all the dust and reseat it again. Remove all dust from the computer slot also, so that proper contact is made between the RAM card and the PCB. Take care to ensure that the memory is fixed tightly, else you could face a problem again.

5. In most cases, the problem is solved at this stage. If  it still persists, a part may have got damaged,  so you may have to get replacement parts according to the diagnostic code. If you have a spare computer, you could swap removable parts. In most recent model computers, most of  the components are soldered onto the motherboard, so instead of repairing a part, it is better to get it replaced.