Shut down your Notebook, upon restarting your HP Notebook, spam the F2 key this will open the Hp System Diagnostics, from there perform a 'Memory Extensive Test' and 'Hard Disc Extensive Test'
Restart > Spam F2 > Hp System Diagnostics > Memory Extensive Test / Hard Disk Extensive Test
See if it fails, if it does this could be down to a problem with the newly installed RAM. (As a HP Notebook owner I've experienced this)
The fact that it shows that your system can't detect what brand of RAM your system is using tells me that there may be some sort of compatibility issues, did you check that the newly bought RAM is correct for your notebook? Be 100% sure, just because someone behind a counter says it will doesn't always mean it will, HP themselves
would be a better source of finding out if it is or isn't.
Have you tried using the original RAM that came with the Notebook?
Here's my notebook, as you can see my RAM is 'Samsung'
http://i61.tinypic.com/nxu9eo.png
Randomly rebooting could be a few things, overheating, memory issues, battery problems...
Start by downloading a popular program for monitoring the temperature among other things:
http://www.cpuid.com/softwares/hwmonitor.html
Keep an eye on the temperature of you notebook and try to get a feel for the temperature it restarts at. Use a can of compressed air in the reverse direction of the normal air flow while the computer is off. Try running the computer with only one memory chip at a time and try each slot. Then try the other chip if you have two. If you only have one, at least try the other slot. Try running the notebook without the battery and just the power adaptor. Try a hard reset:
http://h10010.www1.hp.com/ewfrf/wc/d...roduct=1132551
As for using AMD OVERDRIVE follow this link;
http://www.ehow.com/how_12226406_amd...-tutorial.html