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forumbruker Student
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Black screen and BIOS corruption blink code.

Probook 6550b

This notebook is out of support, so I don't know if it's right to post here.


When I start the computer the screen never turns on (no background illumination either).  But the LEDs lights up and I get blinking codes. Seem like it's two different stages for the blinking code (I call it "stage 1" and "stage 2").


"Stage 1":

When I turn the computer on, the num/caps lock blinks twice several times. In this stage it's possible to turn of computer by holding down power button. If I then start it again it will still be in "stage 1". If I don't turn off it will eventually restart and go over to "stage 2".


"Stage 2".

Only caps-lock flashes with a constant rate. If flash drive is connected it reads this in 2 about seconds. After about 20 seconds the fan starts spinning for full. I can't turn off other than diconnecting power.  If I reconnect power again and press power botton it continues in "stage2".


To get it back to stage one I need to remove the clock battery and hold down power botton. But if I hold down win+B after doing this I still get directly to "stage 2". Therefore I guess it's automatically trying to restore BIOS is "stage 2".


I tried to create recovery flash drive with the SP73917 BIOS. When it's unpacked nothing more happens, but I found out it's a SP73917_E.exe and SP73917_F.exe inside the unpacked folder wich can create BIOS flash drive. But I have tried both and nothing happened when I started computer with og without holding down win+B.


I guess the drive I made was only for updating BIOS and not for recovering. Is there a special way to make a flash drive or a special partition on the harddrive? I have not the original hdd with system partition, just an empty HDD. But I can connect the new HDD to a working windows/linux computer and add some data/partitions if someone knows what to add.


Is it likely that it's no hope for recovering this? If so, is it enough to solder on a new BIOS or is maybe other parts of the main board that is broken?

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