Question about HP Pavilion dv9420us PC Notebook

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After turning on the laptop the screen does not turn on The screen is black and the lights are on

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This is a somewhat common problem with hp notebooks that I see and work.

Some questions to consider:
Do the lights stay on, along with the fan?
If so, it is possible either the motherboard or the screen have issues.

Do the lights flash?
If so it is almost always the motherboard.

Does the computer beep when powered on?
If so, the ram is probably the issue.

Does the computer work with an external screen?
This can eliminate the possibility of a bad laptop lcd.

For the first two, I would have to recommend having the machine tested. If it works with an external screen testing can be done easily with UBC or some other bootable testing environment. If not, I would say take it to a repair shop.
If it beeps, try taking out the ram, blowing out the ram slots and replacing the sticks. This may help. If not try taking out one stick, and then if still not working, switching and taking out the other.

//halfs

Posted on May 25, 2010

  • mkapuscik Nov 11, 2010

    I have the same exact problem as well as many others who purchased dv9400 series laptops. The cause is due to a faulty NVIDIA graphics chipset. I've been trying to get HP to help me with this problem with no satisfaction. Thankfully, I ran into a post today where there is a class action lawsuit brought against NVIDIA (NVIDIA GPU Litigation, Case No. 08-cv-04312-JW) The final court date hearing is scheduled for December 20, 2010. If awarded, the Claims Period will not begin until after the Final Hearing. Please go to "NVIDIA GPU Litigation" website for more info. If awarded by the Judge, it looks like you will need to fill out a claim within 60-days of the final hearing date.http://www.nvidiasettlement.com/
    There are many different series of HP laptops that are included in the litigation along with a couple of Dell

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You could have a dead hard drive or graphics card.

Posted on May 25, 2010

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bhagyavichar
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SOURCE: laptop turns on but screen stays black

probably itz either minor case of software corruption/improper ground/cpu fan..
or major case of faulty or defective main board/ram/addon/daughter cards..

..plz do check the following as in order:..
the Hardware part:..
1)a) in power-on mode, open/unplug the data/vga cable of the monitor from cabinet..see if raster or 'osd' is appearing on the monitor screen..if so monitor is ok..else replace the monitor and see..[not applicable in case of laptop]..
b) in case of laptop try to get output from external display unit/monitor using vga port..if there's proper display in there..the problem is probably with either the 'lcd' or 'ccfl' or 'inverter circuit'..

2) if u hv a graphics card, replace with a standby or onboard and see..[not applicable in case of laptop]..

3) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

4) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..

5) a) see if ur hdd is noisy or emitting any 'ticking' noise (like 'tuk tuk' or 'kirr kirr')..
b) or if the system is not supporting either the newly installed device or itz software/driver /firmware
if so, u need either a fresh os installation or ur hdd is likely to b replaced..

6) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistance n many more..resulting an increase in heat..

7) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink Compound" (available in local electronics chip level spare market)between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it tightly in position..

8) on main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(espabove1000mfd)/mosfets..go through the mb's south bridge n the circuit lie around atx connector..the crystal clock generator (if cpu isn't heating up)..

9) [in case of desktop] the smps itself may b defective/faulty..check the outputs of smps viz. 0v (black~ground); +12v(yellow); +5v (red, green~ps-on, violet~pg& grey~sb); -12v (blue);-5v(white); +3.3v(orange)..the 'oscillator and error amplifier ic',or pwm switching regulator circuit..look for defective protector-transformer/resistance (esp 4.7k)/mosfet..
check the battery n adapter [main power], in case of laptops..

for any further assistance u may plz leave comment and or testimonials at any point of time, so that i/we can help or u think it to b helpful..

if u r not a professional, always better to seek advise from ur system admin/vendor....

Posted on Nov 23, 2009

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