compaq presario cq56 115dx will not power on blinking lights, not a disk drive problem

[rajpodn]

I own two identical Compaq Presario CQ56 115-DX, and the one I use every day stopped powering on.  Shows blinking caps lock light and orange WIFI light does not turn blue to turn on.  The fan powers on, but the screen doesn't come on at all.  I tried hard resetting several times and it didn't work.  I swapped the hard drive of the malfunctioning CQ56 to the other one that was working normally, and it works OK normally.  No hard disk corruption or problems.  

Any idea how to fix this problem laptop?

[appleblossom]

This document lists LED blink codes, which you might find helpful. Let us know if you learn anything more about this problem!

[rajpodn]

The blinking message indicates the CPU has malfunctioned and needs to go in for repair. Where can I find info on swapping the CPU myself?

[Great-Deku-Tree]

Hey @rajpodn ,

Welcome to the HP Forums!

I understand you're looking for info on swapping out the CPU in your notebook. 

You will find everything you need here: Compaq Presario CQ56 Notebook PC - Maintenance and Service Guide. The instructions you need start on page 75. Keep in mind that the CPU itself may not be the issue, it could be the socket on the motherboard preventing the notebook from reading the CPU, so even replacing the CPU may not work, as you may need a replacement motherboard. I do not suggest replacing the motherboard as doing so requires HP Proprietary software to reinstall the Service-ID necessary for reinstalling Windows.

*Caution - If you do install the new CPU be careful with the thermal paste. A small pea sized amount should be more than enough. Put the paste in the exact center and carefully spread so there is a fine layer almost to the edge of the CPU. Remember that the heatsink will press very firmly onto the CPU and spread the paste more and you don't want any squishing out as this can cause electrical shorts if the paste has a high metal content.

The part you will want is: AMD V140 processor (2.3 GHz, 512-MB, L2 cache, 1066 MHz, 3.2 GT/s)—singlecore 25 W. The part number for this is: 616333-001.

You can order the CPU directly from HP here: HP Part Surfer, but you may be able to find it cheaper on sites like eBay, Amazon, or Newegg.

Hopefully this covers everything you're after! 🙂