HP Probook 6555b laptop black screen

  howard64 17:42 07 Dec 2018

Once in a blue moon this laptop on boot up works perfectly. Most times lights flash the fan runs but nothing appears on the screen which remains black. This laptop has 4GB ram and is running an activated windows 10 installation. I have tried different ram and a different power supply. I have removed the battery and power lead then held the power button down for up to two minutes. Nothing makes this laptop fully boot up. I have tried thirty attempts with no luck. When it runs as long as it is not switched off it is great but it looks as though it is going to be scrapped. Can anyone suggests anything else I can try?

  Fruit Bat /\0/\ 21:22 07 Dec 2018

Try renewing the CMOS battery.

  howard64 12:39 11 Dec 2018

thanks Fruit Bat /\0/\ I normally do that as one of the first fault finding actions. The battery was dead but fitting a new one made no difference. It is a shame as when working this is a very good laptop.

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