Hello, I got a problem with my HP nc6400 notebook. It somehow produced a blue screen with error code: 000000C2. Does anyone have further idea to solve this? Here are what I already did: 1) I ran a memory test tool on the BIOS and it is ok. 2) I ran a memory test tool downloaded from www.memtest.org and it is ok. 3) I ran a memory test tool from microsoft webiste and it is also ok. 4) I replaced one memory with the new one borrowed from my friend. The problem still happen once or twice a day. (There are another memory located uner the keyboard so I cannot test by replacing this one) 5) I also picked a harddisk and usb mouse from my another notebook to test. The problem is still remaining. The sample from Event viewer log are: 7/3/07 10:42:03 PM Error code 000000c2, parameter1 00000007, parameter2 00000cd4, parameter3 0213000d, parameter4 876226d8. 7/2/07 10:57:59 PM Error code 10000050, parameter1 bad0b148, parameter2 00000000, parameter3 805b9e1d, parameter4 00000003. 7/2/07 7:42:31 PM Error code 000000c2, parameter1 00000040, parameter2 00000000, parameter3 80000000, parameter4 00000000. 7/2/2007 11:06:28 AM Error code 000000c2, parameter1 00000007, parameter2 00000cd4, parameter3 02130006, parameter4 86ab7238. 7/1/2007 10:43:44 PM Error code 10000050, parameter1 8c480000, parameter2 00000008, parameter3 8c480000, parameter4 00000000. I do not know what to do with windows dump files. I have some at C:\Windows\minidump. So I attached if any of you can help me find the root cause of the problem. Many thanks for your further help. Let me know if you wish more information.