HP dv4 turns off and now has flashing caps lock and scroll lock

Keyboard problem. Bring it back where you bought it.

Computer does not boot up The problem maybe the RAM, it could be faulty or just needs reseating to make proper electrical contact.
Reseat the RAM and then boot up your laptop. If it still does not boot up then remove the RAM module/s and take them to your friendly computer repair shop and get them to test the RAM for you. Just like you sometimes need a mechanic to repair your car, sometimes you do need a technician to diagnose and identify the fault or faults on your computer. Not only does a good service technican have the experience to deal with this type of problem, they also have the equipment that allows them to look at things the average computer user can't see, and he has a collection of replacement parts that can be used to quickly test individual components on your computer.

while its off try holding down the function key and the microsoft key and the B button and press the power button and hold all of them down for 5 secs that will get u into the bios look around in there be careful set it for default settings maybe even test battery in bios thats just 1 thing the next step would require a couple small purchases to eliminate the easy things let me know if you want also take out you cd drive gently while laptop is off all the way off not hibernate let me knowl

Since you have graphics on an external monitor, the problem is the Video Cable, or inside the Display Assembly.

http://h10025.www1.hp.com/ewfrf/wc/product?product=3860431&lc=en&cc=us&dlc=en&lang=en&cc=us

This is a general example of a Video Cable, (Display Cable - HP), for an HP Pavilion DV4 series of Notebook PC,

http://www.ebay.com/itm/NEW-ORIGINAL-HP-PAVILION-DV4-LAPTOP-LCD-VIDEO-CABLE-DC02000IO00-486878-001-14-1-/281038275215?pt=US_Laptop_Screens_LCD_Panels&hash=item416f2fc28f

Mouse over to enlarge

The Video Cable connects to the motherboard in an area under the Keyboard, (About where the Fn key is), routes up along the motherboard, then routes up through the left Hinge, and into the Display Assembly.

From there it connects to the screen Inverter (Display Inverter -HP), and back of LCD screen.
It also connects to the LED backlight.

Either connections are loose, or the Video Cable (Display Cable) is damaged.
If the sheath of the cable shows apparent visual damage, so may be the tiny wires inside. (Stretched/Broken)

Connections CANNOT just be visually determined if they are loose.
You MUST physically check EACH connection.

Tightening connections does no good?
Perform a continuity test with a multimeter set to OHM's, on every wire in that Video Cable.

Have an assistant gently wiggle the cable in the middle, and check for an intermittent reading on the multimeter. Indicates broken wire if intermittent reading shows.

OR,

Take Video Cable to the nearest small computer store, and have the resident tech check it for continuity. Should just be a couple of bucks.

Use an ESD wrist strap, and connect it's alligator clip to a good ground source. (Electro Static Discharge)
Average cost is around $3 to $6.

Here is the download page for the free Service Manual, from HP Support,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3860431&

Scroll down, click on -
HP Pavilion dv4 Entertainment PC - Maintenance and Service Guide

Page 92 (PDF page at Top) for motherboard side of Video Cable (Display Cable - HP)

Page 80 for LCD screen, and Screen Inverter (Display Inverter - HP), and LED backlight.

Page 82 has false statements.

Remove the display assembly:

1. Locate the wireless antenna cable (1), and remove from path (2)

Should be;
Locate the DISPLAY CABLE (1), and remove from path (2)

2. Disconnect the wireless antenna cable from the system board (3)

Should be;
2. Disconnect the DISPLAY CABLE from the system board (3)

Somebody was on crack that day.

The wireless antenna cable information that follows, is correct.

Video Cable (Display Cable) is on the Left side.
Wireless Antenna wires are on the Right side.

For additional questions please post in a Comment.
Regards,
joecoolvette

AC adapter (Charger) removed from the laptop, remove the Battery. Wait 1 minute then reinstall the Battery.

Post your findings in a Comment.

Regards,
joecoolvette

check out the blink codes here
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01443366&cc=us&dlc=en&lc=en&jumpid=reg_R1002_USEN

I had the same problem with my hp pavilion dv4 1430 and to fix it I just took out the battery and unplugged it from the power adapter and pushed the power button and waited for a few minutes I put it all back together and started it up and the screen turns right back on.

Hi:
Compaq and Hp are having issues with several models, Go to the HP/Compaqs website, look up your model and see if it is one they are offering free one time repairs on. My friend's dv4 computer was doing same thing, they replaced the motherboard for free, and it took about 2 weeks to get it back.

Compaq and Hp are having issues with several models, My wife just got hers repaired free out of warranty. Go to copaqs website, look up your model and see if it is one they are offering free one time repairs on. Wife's computer was doing same thing, they replaced the motherboard. Took about 2 weeks round trip . Good luck

When you start your PC, Num Lock, Scroll Lock, and Caps Lock don’t automatically toggle on. You can automatically turn each of them on or off whenever your PC starts, for all accounts on the PC. As a practical matter, most people probably want to have only Num Lock automatically turned on, but this Registry hack gives you the power to force any combination of keys on or off.

Start>Run then type in "regedit" whithout quotes.

HKEY_USERS.DefaultControl PanelKeyboard.
Find the String value
InitialKeyboardIndicators. By default, it is set to 0, which means that Num Lock, Scroll Lock, and Caps Lock are all turned off. Set it to any of the following values, depending on the combination of keys you want turned on or off:
0 Turns off Num Lock, Caps Lock, and Scroll Lock
1 Turns on Caps Lock
2 Turns on Num Lock
3 Turns on Caps Lock and Num Lock
4 Turns on Scroll Lock
5 Turns on Caps Lock and Scroll Lock
6 Turns on Num Lock and Scroll Lock
7 Turns on Caps Lock, Num Lock, and Scroll Lock
Exit the Registry. When you restart, the new setting will take effect.

Note: You have problem with Caps Lock so just modify Caps lock option on Regedit.
And do not forget to run virus scan on your computer once you are done.

Rate always the all answers.

Thank you