There was one incident when I turned on my desktop PC and there was no display on my LCD monitor. The desktop was turned on and LED button on the PC was lighted up but the LCD monitor screen was blank. I proceed to check all the cables to make sure that it were firmly slotted into the respective slots at the back of my desktop. Then I checked the LCD monitor to make sure that it was working well. After that, I turned on the PC again and there was power but the PC was not booted up – there was the absence of the normal single beep sound.
I opened up the casing of the PC and then turn off and on the PC again. The desktop PC turned on, I saw the cooling fan moving and the power supply box was also functioning well. Everything seems to work well except that the PC did not boot up – again there was no beep sound. I have previously encountered this problem years ago on my old PC and the technician told me at that time that the memory card ( RAM ) was faulty. He replaced the RAM and the PC worked perfectly thereafter. My current desktop is using 4GB DDR2 memory – there are 2 memory cards in the slot.
What I did was to turn off the power on the desktop, and remove the 2 RAM cards from the slot. Remember to unhook the catch on the left and right side first before you can remove the RAM card. I took off the 2 RAM cards and then slot one of it in; then I turn on the PC – again there was no beep sound. I turned off the power of the desktop and remove the RAM card; then I slot the other RAM in and turn on the desktop again – again failed. Then I remembered that I still have a old RAM card from my previous old PC. Though this RAM card is not suitable for this current desktop; I wanted to try to see whether it can work.
Remember to turn off the power of the computer when you are putting in or taking out the memory cards. I put the old memory card into the slot and turned on the PC, there was a beep sound but there was no image on the LCD monitor. I turned off the power and turn it on again – again there was a clear beep sound but no image. So I took off the old memory card and then slot the two existing RAM cards into the slot again. I turned on the power and viola there was a clear beep sound; the Windows 7 icon appeared on my LCD screen; and the PC was back to normal again. What I was doing is simply to flash the memory module or reset the computer memory. So if you have an old PC, do remember to keep the RAM card; as you may need it in future to reset or flash the memory module in your desktop.
When your desktop PC have no display but there is power, do check the all the cables and power supply first before attempting to open up the PC. When you are opening up the casing of your PC, do remember to turn off the power before touching anything inside – remember safety is paramount.