HP DV5z-1200 Blinking Caps Lock and Num Lock Keys [ Edited ]

[HPisCrap5]

I have seen this issue reported several times on this board. Unfortunately, I am one of those users that is experiencing the same problem. The question is: I have the error code that indicates a non functional CPU... Will replacing the CPU fix the issue that caused this to happen in the first place.... Overheating.....CPU would run at 100 degrees Fahrenheit and then shutdown.. Should I replace the heatsink as well.... The laptop ( if that's what you want to call it ) is of course out of warranty...This will be the last HP product I will ever buy......I wonder why they lost our business at a very large company I work for.... You bet I had a say in that decision...

[Al2]

The CPU may still be fine. 

Before opening up the machine make sure you go through the hard reset and memory reseating that are recommended by HP.  If that does not help, try simply reseating the CPU in its socket (here is the service manual with detailed disassembly instructions) and cleaning the cooling fins around the cooling fan.  You may need to replace the thermal compound which connects the heat sink to the CPU (I have used Arctic Silver 5).  If that also fails, there is a good chance you have a case of bad soldering in the CPU socket, GPU etc.  In my particular case mild overheating (judging by the cooling fan speed) caused poorly done soldering to disconnect and I managed to fix it with a heating gun and lots of patience.  

Hope this helps.

[HPisCrap5]

Thanks A12 for the info... I will post my results when I get a chance to troubleshoot my issue...