my HP COMPAQ Laptop has issue of not displaying anything on the screen but the laptop is turned on so what I did, I open the laptop and look for the video card on the board and then i use a hair blower to blow the video card (advised from an old friend) and then I put it back in, then i turned on and it works. Few days later the problem of not displaying on the screen comes back and i did the same thing and it still resolve the problem. so I did this over and over everytime i had this issue... BUT THE LAST TIME I DID THIS WITH THE SAME ISSUE, MY LAPTOP WONT EVEN TURN ON.. I PLACED THE CHARGER ON IT AND SHOWS INDICATION THAT IT WAS CHARGING AND THEN I PRESS THE POWER BUTTON AND THE POWER BUTTON TURNS ON BUT AFTER 3SEC IT TURNS OFF, SO NOW MY LAPTOP WONT EVEN TURN ON. ANYONE PLEASE HELP ME
It looks like there is a hardware issue or a power related problem. Please make sure all the cooling fans are clean from dust. Disconnect the battery and the power cable. Hold the power button for 20 seconds and then reconnect the power cable. Turn on the PC. Is there any change? If not, there may be a power port or a motherboard issue and I would recommend you to consult with a technician.
Unfortunately I cannot think of some quick repairing you could do at home. The problem is that you can never be 100% certain if the failing component is the motherboard and if it is, it is hard to tell which part of it you should check. You may find some online tutorials on how to fix your motherboard yourself but have in mind that this way you may damage it even further. My advice is to contact someone experienced and with the necessary tools to handle the issue.