ProBook

[KarimK1]

Hello
My laptop is an HP ProBook 4520, its running a 64 bit version of windows 7 , and recently, it stopped booting up succesfully. suddenly I turn it on and the screen stayed balck and there is high fan avtivity the computer would power up, the screen would stay dead, and the caps lock lights would blink regularly 3 times each time.

I've tried to remove the battery and pressed the power botton for a minute and turn it on with the ac adapter only but no luck same problem again.

Any suggestions? I'm sure it's out of warantee.

Thx.

[Dragon-Fur · Accepted solution]

The "three" blink sequence says it is memory.

HP Notebook PCs - Computer Does Not Start and Emits an LED or Beep Code

Caps Lock/Num Lock

3

Memory

Memory module error not functional

Reseat memory modules (see next section). Test memory from UEFI or BIOS. Replace bad memory modules. Service

[KarimK1]

Thx it works i got it fixed

[Dragon-Fur]

You are welcome!

Happy New Year 2013 !

[Divided5]

I have the same problem but without the three caps blink. Hp probook 4520s starts as normal, but the screen is off. The wifi LED used to turn white, but now it just stays yellow. I hear the fan working, and the drive or proccesor led is blinking as if it's working. After some time it reboots and goes into a reboot loop. I cannot see anything on the screen. No sound either