I tried to fix Hp G62 laptop with AMD processor. It wasn't on the screen while pressing power button at once and flashing Caps Lock key once for a second. If I long press power button after not on the screen when press the power button, Next time I on the laptop It works on the screen and working well. But after shutdown and power on again it was blank screen .I have to press power button till power Off and have to on again to get screen.
This problem started after fixing replacing LCD cable, it worked well .but after a kid played games untill overheating the processor. he let it to off it self after draining battery with showing blank screen, Laptop came again.
I removed cpu and heated it. Set to socket without heat sink. power on and wait a minute saveral times but no heating cpu. once laptop off after overheated the CPU. applied thermal paste and assembled. It worked well.
After a 2 days it came again. I think he gaming again, This time I think to update BIOS.Also Symptoms is it is not giving screen on at once. after power off and on working .but problem is again while pressing on another time.
My sister has a HP G62-340US laptop computer which was working fine for about 2 years. Suddenly went to Black Screen and the Caps lock was blinking once every second or so. I read up on the problem with all I read it was time to dump this HP. I started researching again and one person said he held the Escape Key down when rebooting, so I gave this a try...IT WORKED!! I left it on and did all the updating, scan for malware, etc. some things had to be restarted after Malware finished and it did restart just fine, then walked away when I came back the Black screen was on again so I figured it had something to do with it going to sleep wasn't sure what time was set to do so, I manage to reboot again holding the escape key down. When I finished with all I could do the test was to shut it down and try again to see if it would start normally. Windows updates came on had a lot to updates (27) so I left. When I returned it had shut down, tried again the holding down Escape Key and the start button...nothing tried over and over nothing, would not come on. Then I decided to just leave it on for a while with the Black Screen about 30 minutes later tried again and it worked. So I guess if you leave the computer on for a while it will come on. At less I know now everything is working the LCD screen, no new parts it seem like a nightmare people where having with this HP G62-34OUS. It's worth a try and maybe get a little more mileage out of your computer you just have to hold the escape key down when rebooting. I did change the setting for it not to go to sleep and will use a screen saver until shutting it down. I hope this helps someone my sister could not afford another computer.