I have an HP D7-4177nr Laptop, I replaced the motherboard because there was no video and the caps lock was blinking 5 times (bad video), got the new motherboard still no video now 1 blink on caps link now (bad CPU).

So I thought I got a DOA CPU, bought another one same thing. Please help, has anyone had this problem.

I also plugged in a external monitor so I know the screen is GOOD. What else could it be? Replaced with OEM motherboard.Sorry I can not help you. Just want to tell you your request is being read.

BTW; you can type with just the default font.

Unless you are a trained service technician, I would SUGGEST you sell the computer and the motherboard for 'as-is' parts and invest in something else.

To my knowledge, keyboards have no way of knowing if the motherboard is  failing.

If you can turn on and off the caps lock light, most of the motherboard is working. It takes over 90% of the chips running to just toggle the caps lock.
Wolfwatcher81, Welcome to the forums. I modified your post to make it more readable.

Did YOU replace the motherboard, or did authorized service technicians replace it?I replaced it myself, please see this hp site about POST codes

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01732674&tmp_task=solveCategory&lc=en&dlc=en&cc=us&lang=en&product=3860630#N215This is what I found  on HP

Caps Lock/Num Lock   1   CPU   CPU not functional   Reseat replace CPU.

Caps Lock/Num Lock   2   BIOS    BIOS corruption failure   

Caps Lock/Num Lock   3   Memory   Memory MODULE error not functional   

Caps Lock/Num Lock   4   Graphics   Graphics controller not functional
   
Caps Lock/Num Lock   5   System board   GENERAL system board failure
   
Caps Lock/Num Lock   6   BIOS   BIOS authentication failure   


May I ask, why didn't you send it for repair?costAh, totally understand. It can get pretty ridiculous without warranty.

When you power on the computer, does the HP splash screen come up?No Black Screen, and also tried external monitor.  Are you sure everything is connected properly (within the laptop)?

Make sure the RAM is seated properly (and in the right spot).

If you hook up a USB keyboard, does the light also blink?Found the problem bad GPU on both motherboard's did a reflow and now works with original CPU.

Reflowed GPU, North bridge, and South bridge with liquid flux and heat gun, now works perfect wit the original CPU.
Good to know!