Your laptop HP Classmate Notebook PC turns on, but the screen stays black
there is no display with Power light ON and Fan ON. When you push on the power
button the leds lights up, cooling fan works but nothing appears on the screen.
The screen is completely black. There is no image on the screen at all.
Possible problem:
·
Backlight failure; First of all, take a closer look at the
screen under bright light. It’s possible the screen shows the image but it’s
very faint. In this case you have a backlight failure. Test the laptop with an
external monitor connected to the VGA or HDMI port, if the external monitor
works fine even though the internal screen didn’t light up, then most likely
there is nothing wrong with the video card. Backlight failure can be related to
faulty inverter board or bad backlight lamp, check them and replace the faulty
one.
·
RAM failure; your laptop HP Classmate Notebook PC
turns on, but the screen stays black there is no display with Power light ON and
Fan ON. It’s possible one of the memory modules failed. In this case you can
try cleaning and reseating memory modules to make sure they are making good
contact with the slot. You can try removing memory modules one by one and test
the laptop with only one module installed. You can try replacing memory
modules. If reseating/replacing memory doesn’t help, try removing the hard
drive, DVD drive, modem, wireless card, keyboard, etc… In other words,
disassemble the laptop to bare minimum and test again. If the laptop still
doesn’t turn on, most likely you have failed Video card, processor or
motherboard failure
·
Screen faulty; your laptop HP Classmate Notebook PC turns
on, but the screen stays black there is no display with Power light ON and Fan
ON. The screen is completely black. Test the laptop with an external monitor
connected to the VGA or HDMI port, if the external monitor works fine. In this
case most likely you have you have a faulty screen.
·
Bad video cable connection; when you push on the power button the led
lights up, cooling fan works but nothing appears on the screen. The screen is
completely black. Test the laptop with an external monitor connected to the VGA
or HDMI port; if the external monitor works fine you have bad video cable
connection, check the video cable connection.
·
Video card failure; your laptop HP Classmate Notebook PC turns
on, but the screen stays black there is no display with Power light ON and Fan ON.
When you test the laptop with an external monitor connected to the VGA or HDMI
port, the external monitor stays black no display. In this case probably you
have failed video card, repair or replace video card.
·
Processor failure; your laptop HP Elitebook 8440p turns on,
but the screen stays black there is no display with Power light ON and Fan ON When
you test the laptop with an external monitor connected to the VGA or HDMI port,
the external monitor stays black no display. In this there is chance you have
failed Processor, reseat or replace processor.
·
Motherboard failure; when you push on the power button the led
lights up, cooling fan works but nothing appears on the screen. The screen is
completely black. When you test the laptop with an external monitor connected
to the VGA or HDMI port, the external monitor stays black no display. In this
there is chance you have failed Motherboard, check motherboard electronics components temperature with
your finger and test the voltage and continuity with a voltmeter. The failed
electronic component has to be replaced.
·
BIOS failed, motherboard electronics components look
good, System power (3V/5V) work fine, you can measure the 3.3V and 5V on the
motherboard, No electronics components have short or overheating and 3.3V on
the power button, BIOS has to be reprogrammed (flash bios).
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