kizwan Posted October 1, 2012 Share Posted October 1, 2012 Hi all!My notebook somehow died a couple of weeks ago. It's not totally dead but now it ON-OFF loop when I turn on the computer. It's like this:-Turn ON >> boot up but with blank screen (no backlight either & go on like a minute) >> (auto) turn OFF >> (auto) turn ON for only one second >> (auto) turn OFF >> boot up but with blank screen (no backlight either & go on like a minute)and it repeats indefinitely until I turn it OFF by pressing the power button. Anyone know what this means? My best guest the CPU kaput; it tries to initialized CPU but failed. I troubleshoot it by putting a quad-core (i7-720QM) processor which I know this notebook doesn't support because this notebook is Nvidia Optimus powered notebook (it use Intel HD Graphics as primary adapter). With quad-core processor, it doesn't do ON-OFF loop but it stays ON indefinitely (with blank screen) until I turn it OFF.Specification:-Asus A42JV notebook (at some part of the world it's called K42JV)Intel i5-450M4GB DDR3-1066Intel HM55Please let me know if you need more information. Thank you. Quote Link to comment Share on other sites More sharing options...
Founder Brian Posted October 1, 2012 Founder Share Posted October 1, 2012 I doubt the cpu is dead, Intel processors rarely fail. Most likely you have a dead motherboard. Have you tried removing the memory modules one by one to see if you can post?Sent from my GT-N7000 Quote Link to comment Share on other sites More sharing options...
kizwan Posted October 2, 2012 Author Share Posted October 2, 2012 I tried one memory module at a time & tested on each slot. I also tested both modules on my other notebook & confirmed they're ok. Also, I did tested with another set of RAMs. Unfortunately, none of this change anything. I'm able to triggered BIOS recovery mode (it reads optical disc that contain BIOS UEFI file when booting with CTRL + HOME keys). This show motherboard not fully dead, right? Maybe failed when P.O.S.T.-ing? But I don't know what failed. The ON OFF loop must be means something. I wish someone know.I forgot to mention one thing; before this problem happen, last thing I did is exiting BIOS UEFI by pressing F10 (save & exit). Prior that, I didn't change anything in BIOS UEFI. Quote Link to comment Share on other sites More sharing options...
maykon_helver Posted October 11, 2012 Share Posted October 11, 2012 try the following.remove the CMOS battery, leave few seconds without battery.Enjoy and if possible check the battery charge with this (use a Multimeter)if not solve, the problem can apparently be the same motherboard.I believe that may be the Intel Chipset. 1 Quote Link to comment Share on other sites More sharing options...
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