Hp pavillion dv4 not booting - black screen and blinking LEDs

[lcfreitasf]

Hello.

I have a hp pavilion dv4 model, which today, out of sudden, stopped booting. Though the lights are on (power, touchpad, etc), it only shows a black screen. No sound coming from hd or fan. The scroll and caps lock LEDs keep blinking, they don't stop ( I already checked the led code table And this is none of them). I already hard reseted it. Anything else I can do?

[Danjen]

Just saw another person with this problem. The led sequence indicates insufficient power:

http://support.hp.com/us-en/document/c01732674

Check your battery. Try to boot without the battery installed. Try a different plug (wall outlet).

[lcfreitasf]

Hi danjen, thanks for answering. I already tried these and it still doesn't work. Actually just after you press the power button the hd and fan start spinning but stop shortly after.

[Danjen]

Still thinking about it but in the mean time, try running it on just one memory chip at a time.

[lcfreitasf]

That's something possible, I had problems with memory in this computer before. I don't have a wrench to open the computer right now, is there are way of doing it without opening it?

[Danjen]

The memory is usually under a plastic rectangle on the back of the notebook. You usually use a small phillips screwdriver to remove the screws and plastic plate. Once the memory is exposed, you move the clips to the sides and rock the memory chip forward.

[lcfreitasf]

Hi, just tried that and again same thing happened. I tried even turning the computer on with no memory card at all to see if a new thing could happen (a blue screen or an error message) and still I got the black screen and constantly blinking LEDs.

[hunterrmk]

I'm having a similar problem - I press the power button and the led on the front blinks 3 times and nothing happens.  No hard drive spinning, no fan.  I tried the power reset and reseating the memory modules, still same result.  Any ideas?

[salvador_45]

same case on my laptop , any feedback recieved yet ! plz. do reply in our case anyoneeeee there ? . tnx so much 

[Danjen]

Here is a video on one of the most common problems of the DV series up to the 9000:

http://www.youtube.com/watch?v=UDYWFyD04xs&feature=player_detailpage#t=2s

In all of your cases, I think this is what will have to be done.  This particular video is done crudely with a torch and I would recommend a shop that uses an actual reflow station with controlled temperature profiles. At the very least a heatgun with temperature control.

Here is another video that does show a slightly different problem than is described here but at the very end, it scrolls real fast a standard answer I have read here before for trying to get your video back:

http://www.youtube.com/watch?v=UDYWFyD04xs&feature=player_detailpage#t=5s

It reads:

The screen might work again if you:

- Disconnect the power cord & remove the battery

- Wait 2 minutes then disconnect power cord.

-Press and hold the power button for 45 seconds.

- Press power button to turn on laptop. The LCD should work at this point.

I have found that if it is the video chip, this will not work for long.