Hello,

 I have a HP 6515B laptop running WINDOWS 7. I turned on my computer but the display never turned on. After a few minutes, I turned it off and back on again, but the display was dark. This went on for about an hour, when I took a look at the 4 lights on the front left of my laptop in front of the KEYBOARD. The 2 most left lights were on, and they were BLUE. The 3rd light was off. And the 4th light was yellow. The icon on top of the yellow light was a disc, so I figured that the problem was my hard drive. So I turned off the computer, removed the hard drive, replaced it with another hard drive, and turned my computer back on. But the light was still yellow. So I turned my computer off and on for about 4 hours, and the display finally came back on. But when I turn my computer off, I have to turn it off and on about 30 times before the screen display turns on.   I do not see any ERRORS or flags when I look at Display ADAPTERS in Device Manager. Does anyone know what caused this?

Thank you
First of all, a hard drive will usually not cause your display to not turn on unless it shorts power somehow and the computer would turn off, but not be running. You could try removing the battery and unplugging the laptop and hitting the power button a couple times. This can clear any charges components have stored in them. Then put your battery back in and plug it it and try turning it on. If that doesn’t work and the cause is with hard drives, try removing the hard drive and not putting anymore in and do a power on test. Report back here with results.

Hope this helps,
Anthony