Hi all,

this is my first topic here, so please be nice  Also I do apologize in advance for my approximative English, I'm belgian and speak French, but I will do my best to be clear.

My problem is :

My computer does reboot randomly when playing games (especially BF3) but I don't know if the game is really causing troubles.
I can play 10 minutes or sometimes more 2-3 hours, then my screen goes black (sound freezes) with 'no hdmi signal' message. My pc then keeps turning, but nothing responds (no ctrl alt del), no CPU led. I have to shutdown and then reboot to get everything working back (sometimes it keeps saying no video signal on the screen even if the computer is booting)

I've been searching for 2 weeks on forums and nothing seems to be working for me :
- 6 hours memtest didn't find anything
- CPU/GPU test with OCCT software (stress tests..)
- My bios and drivers are up to date
- I bought a new PSU (antec 600w)
- I did a new clean install

Windows event logs shows only one message '' KERNEL POWER ERROR ID 41 task 63 "

My config :
Windows 7 Ultimate x64
Asrock 770 (new)
AMD Athlon II 6400 quadcore
4Gb Adata DDR3 1333mhz
GTX550 ti 1gb (new)
PSU Antec 600w (new)
2 standard 500gb hard disks (western digital and maxtor, both working fine)

If you have any CLUE, I'd appreciate it a lot, Many PEOPLE are suffering of this and giving many fixes but I can't find mine.
Thx! 

Sorry for language mistakes, tell me if you can't catch something I said  Researching this issue on your behalf a common thread of probable cause keeps recurring. I don't know if you have been posting this issue on other tech forums (or just viewing them) under a different name but i have found when searching with this " KERNEL POWER ERROR ID 41 task 63" parameter a single solution keeps arising that does solve the problem.
 It is that users having this issue have had more than one sound device (and drivers) installed and once all but one were removed the issue disappeared. Is that possibly your case? Have you investigated if it is what happens if you reduce to only one audio device?truenorthThanks for your quick answer truenorth

Indeed I have multiple audio drivers, the one of my mobo 'High definition audio controller' (4times in the peripherals list) and the one of my Geforce graphic card. I tried to uninstall the motherboard hd audio drivers and disable the integrated audio chipset in the bios, but it comes back everytime.

The Nvidia hd audio driver is uninstalled, but still encountering the problem so far.Hey,

just giving some feedback, I dit what truenorth and Blong told me, and everything has been working fine since my last post.
I hope it's fixed. (It was a driver problem, I disabled all the chipset on my mobo and deleted useless drivers, the only ones left are Nvidia drivers)

Thanks a lot guys Please confirm all your drivers are up to date
http://www.asrock.com/mb/download.asp?Model=770%20Extreme3&o=AllA1exiis, Very good to hear that that which was seemingly the solution that had worked for others also worked for you. When all else fails come to us on the CH forums  truenorth