Random system reboots

Hi there. I'm experiencing random reboots on windows and kernel panics on linux.

Here the story:
In day-day usage I'm using linux. Like 6-7 days ago I got a kernel panic (for those who are not familiar with linux its like BSOD on windows), it said Machine Check Exception. I didn't pay attention to it. It keep happening the next day, and the next one, until I got a BIOS message "CPU Overheat, Press F1 to resume". I knew that my cpu is hot but it looks like the stock HS became bad or something like this. So I bought a new HS and it cools the CPU very well now.
Tough my problems don't end here. I still had kernel panics in linux (couldn't see the message cause run graphics env), so to isolate any driver problem I moved to windows. So in windows I got random reboots, no BSOD, no log just reboot. I don't know what to do :(

One note: before mounting a new HS i removed everything and cleaned everything from dust.
One more note: I run a 12 hours memtest and it completed with 22 pass and 0 fails.

Hardware info as retrieve from Everest:

Sensor Properties
Sensor Type Winbond W83627EHF/EHG (ISA 290h)
GPU Sensor Type Diode (NV-Diode)
Chassis Intrusion Detected No

Motherboard 32 °C (90 °F)
CPU 46 °C (115 °F)
Aux 119 °C (246 °F)
GPU Diode 58 °C (136 °F)
ExcelStor Technology J880 32 °C (90 °F)
Hitachi HDS722516VLAT80 34 °C (93 °F)

Cooling Fans
CPU 1974 RPM

Voltage Values
CPU Core 1.33 V
Aux 3.50 V
+3.3 V 3.28 V
+5 V 5.54 V
-5 V -0.83 V
+5 V Standby 4.97 V
VBAT Battery 3.20 V

CPU Properties
CPU Type Intel Pentium 4 630, 3000 MHz (15 x 200)
CPU Alias Prescott-2M
CPU Stepping N0
Instruction Set x86, x86-64, MMX, SSE, SSE2, SSE3
Original Clock 3000 MHz
Min / Max CPU Multiplier 14x / 15x
Engineering Sample No
L1 Trace Cache 12K Instructions
L1 Data Cache 16 KB
L2 Cache 2 MB (On-Die, ECC, ATC, Full-Speed)

Multi CPU
Motherboard ID ASUSTeK
CPU #1 Intel(R) Pentium(R) 4 CPU 3.00GHz, 2998 MHz
CPU #2 Intel(R) Pentium(R) 4 CPU 3.00GHz, 2998 MHz

CPU Physical Info
Package Type 775 Contact LGA
Package Size 3.75 cm x 3.75 cm
Transistors 169 million
Process Technology 7M, 90 nm, CMOS, Cu, Low-K Inter-Layer, High-K Gate, Strained Si
Die Size 135 mm2
Core Voltage 1.3 V
I/O Voltage 1.3 V
Typical Power 84 W @ 3.00 GHz
Maximum Power 101 W @ 3.00 GHz

CPU Manufacturer
Company Name Intel Corporation
Product Information http://www.intel.com/products/processor

CPU Utilization
CPU #1 / HTT Unit #1 3 %
CPU #1 / HTT Unit #2 0 %

Motherboard Properties
Motherboard ID 65-0401-000011-00101111-052905-I848P$A0165011_BIOS DATE: 05/29/05 11:18:53 VER: 08.00.10
Motherboard Name Asus P5P800S

Front Side Bus Properties
Bus Type Intel GTL+
Bus Width 64-bit
Real Clock 200 MHz (QDR)
Effective Clock 800 MHz
Bandwidth 6400 MB/s

Memory Bus Properties
Bus Width 64-bit
DRAM:FSB Ratio 1:1
Real Clock 200 MHz (DDR)
Effective Clock 400 MHz
Bandwidth 3200 MB/s

Chipset Bus Properties
Bus Type Intel Hub Interface
Bus Width 8-bit
Real Clock 67 MHz (QDR)
Effective Clock 267 MHz
Bandwidth 267 MB/s

Motherboard Physical Info
CPU Sockets/Slots 1 LGA775
Expansion Slots 5 PCI, 1 AGP
Integrated Devices Audio, LAN
Form Factor ATX
Motherboard Size 200 mm x 300 mm
Motherboard Chipset i848P
Extra Features JumperFree, Stepless Freq Selection

Physical Memory
Total 1023 MB
Used 603 MB
Free 419 MB
Utilization 59 %

Swap Space
Total 2463 MB
Used 520 MB
Free 1942 MB
Utilization 21 %

Virtual Memory
Total 3487 MB
Used 1124 MB
Free 2362 MB
Utilization 32 %

Paging File
Paging File C:\pagefile.sys
Initial / Maximum Size 1536 MB / 3072 MB
Current Size 1536 MB
Current / Peak Usage 104 MB / 109 MB
Utilization 7 %

Physical Address Extension (PAE)
Supported by Operating System Yes
Supported by CPU Yes
Active No

BIOS Properties
BIOS Version 1004.001
System BIOS Date 05/29/05
Video BIOS Date 05/20/05

Memory Module Properties(I HAVE TWO OF THIS)
Module Name Kingston K
Serial Number XYZ
Manufacture Date Week 32 / 2005
Module Size 512 MB (2 ranks, 4 banks)
Module Type Unbuffered
Memory Type DDR SDRAM
Memory Speed PC3200 (200 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings
@ 200 MHz 3.0-3-3-8 (CL-RCD-RP-RAS) / 11-14-2 (RC-RFC-RRD)
@ 166 MHz 2.5-3-3-7 (CL-RCD-RP-RAS) / 10-12-2 (RC-RFC-RRD)
@ 133 MHz 2.0-2-2-6 (CL-RCD-RP-RAS) / 8-10-2 (RC-RFC-RRD)

Memory Module Features
Early RAS# Precharge Not Supported
Auto-Precharge Not Supported
Precharge All Not Supported
Write1/Read Burst Not Supported
Buffered Address/Control Inputs Not Supported
Registered Address/Control Inputs Not Supported
On-Card PLL (Clock) Not Supported
Buffered DQMB Inputs Not Supported
Registered DQMB Inputs Not Supported
Differential Clock Input Supported
Redundant Row Address Not Supported

Graphics Processor Properties
Video Adapter nVIDIA GeForce 6600 AGP
BIOS Version
GPU Code Name NV43AGP
PCI Device 10DE-00F2 / 0000-0000 (Rev A4)
Transistors 143 million
Process Technology 0.11 um
Die Size 150 mm2
Bus Type AGP 8x @ 8x
Memory Size 256 MB
GPU Clock 301 MHz (original: 300 MHz)
RAMDAC Clock 400 MHz
Pixel Pipelines 8
TMU Per Pipeline 1
Vertex Shaders 3 (v3.0)
Pixel Shaders 8 (v3.0)
DirectX Hardware Support DirectX v9.0c
Pixel Fillrate 2408 MPixel/s
Texel Fillrate 2408 MTexel/s

Memory Bus Properties
Bus Type DDR
Bus Width 128-bit
Real Clock 250 MHz (DDR) (original: 250 MHz)
Effective Clock 501 MHz
Bandwidth 8016 MB/s

Fan Speed 0%

nVIDIA ForceWare Clocks
2D/3D GPU: 300 MHz, Memory: 500 MHz

EzCool 450Watt PSU holds this system.

Thanks a lot for any kind of help!
5 answers Last reply
More about random system reboots
  1. The Pentium 4 series are VERY hot CPU's, Please run a program like Prime95 to stress the CPU level to get it to its maximum temp
    Then use a program to monitor your Temps, Last time i checked Everest can do that too.
  2. I ran OCCT for 20 minutes, and there were no errors. Ill run Prime95 later today when back from college.
    I checked for bad capacitors and there seems like none, tough I need to do it better and to check the photos I made.

    Any more suggestions?

    I've been told that it might be a PSU problem on +5V or +12V rails, instability issue. How I can test this? My assumations that on high load the +5V or +12V rails are unstable and this cause the kernel panic in linux or reboot in windows.

    Any suggestions?
  3. About the only way to test is by substitution.
  4. I run all test on OCCT here are the results:

    GPU Test: success without errors
    Power supply test: reboot after 7-10min
    CPU test: success without errors
    Power Supply test: Success without error.

    Following anomalies were discovered in Everest during the tests:
    1. CPU Temperature 0C (for short period of time)
    2. CPU Cooling Fan 0RPM (for short period of time) or very high RPM like 3500-4000 (for pretty long period).
    3. 0V on 12V rail.
    4. Maximum CPU temperature on stress test were 48-50C while one IDLE it reached 55-60C, with the same CPU Fan RPM.

    I believe that if its a hardware issue, stress test were not able to solve it and random reboots will return.

    Any suggestions please?
  5. If you want to test your 12v rails you will have to get a voltage meter, Sorry if that's the incorrect name for it

    Even know that you tested your memory through Prime95, You might want to test it through Memtest86+ just because its more thorough, http://www.memtest86.com/

    You also might want to check the connection between the motherboard and the hard drive, A slight knock of the pc might be causing a disconnection of the data flow.
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