Hp laptop won't start

[Gemma uk]

My hp elite book 840 won't start.

I press the power button and it lights up along with the wifi button and mute button. But they immediately go off again.

The screen stays black and the same lights flash at a three second interval.

I've tried taking out the batt and ac adaptor and holding down power button but it does nothing.

Please help!!

 

[GreyCatz]

Greetings Gemma:

I've found this on HP's forum (http/h30434.www3.hp.com/) :

**************
Please refer the following blink codes to identify what is wrong with your PC.

LEDs blink 1 time
CPU
CPU not functional

LEDs blink 2 times
BIOS
BIOS corruption failure

LEDs blink 3 times
Memory
Module error not functional

LEDs blink 4 times
Graphics
Graphics controller not functional

LEDs blink 5 times
System board
General system board failure

LEDs blink 6 times
BIOS
BIOS authentication failure
**************

Some other ideas from the forum:
a) Boot without the RAM modules.
b) Boot without the WLAN module.
c) Boot with AC cable but without the battery.

From your description it might be the WLAN module that causes the laptop to stall. If not, it's most likely the CPU, which is very bad news.

If your laptop is more than two years old, it might be prudent to clean the interior with a very soft piece of cloth (microfibre). Clean as much as you can, even hard-to-reach nooks, and especially anything that rotates/moves. With modern laptops, it takes only minute amounts of dust to cause overheating which will cause the laptop to shut down to protect itself. Also, check that all lids, covers and caps are not jammed or loose. And remove any external devices that might be inserted (USBs, SD cards etc).

Best of luck,
GreyCatz.

 

[jhaydon81]

Most likely a bad ram stick, do you have more than one in it. I know the elitebook has one under the cover in the back and the other is under the keyboard.

 

[schangsut89]

I have the elitebook 840 and I figured out how to start mine. It was doing the blinking thing but would not turn on. I unplugged, removed the battery, and carefully removed the RAM sticks (I had 2 -work computer). I held the power button for 1 minute. Put the battery and RAM sticks back in, plugged it up and it worked! I tried the method without taking out RAM sticks for 2 hours and was getting frustrated. This link helps show how to remove RAM. It's not hard! Im not computer savvy at all!