Purpose of this topic is to create one thread in which all people with the described types of problems can react and communicate, and hopefully come up with solutions or work-arounds. Current count of topics around the net (Google it!) and all shops flooded with RMA's of the P5K series, tell me it's a very big and unsolved problem.
The problem:
The motherboard wont boot or post, or it will but very random or under very strange and specific conditions.
All fans will spin (and keep spinning), all LEDs are on, all disks and USB devices go on but you just don't get error codes (BIOS beeps) or video. With memory removed it sometimes will give the memory beeps though.
Heat and memory seem to make the difference as cold systems tend to have the problem as well as boards with more than one strip of memory installed or with exotic RAM modules.
This problem is everywhere known as the P5K (or P35) 'No post problem' or 'No / cold boot issue'.
IF the board boots, the system is very stable, stays on and is stressable and solid as a rock.
Research done:
For almost two weeks I've read almost hundred threads on forums (e.g. TomsHardware, Asus etc.) and I replaced all components and tried numerous configurations and settings etc.
My personal config:
Asus P5KR rev. 1.02G (or P5K rev. 1.02G), C2D E6750, GeIL Dragon 2 x 1GB DDR2 (or Kingston 2 x 1GB, which is on the Qualified Vendor List QVL), Ati HD3870 PCIe (or Ati X300 PCIe), Coolermaster Extreme Power 450W, Zalman 7700 AlCu.
Standard solutions (all tried of course!):
* Remove all components but CPU and try to get error beeps (works after CMOS clear).
* Remove all components but CPU, RAM and video and start to add from there.
* Replace all components by others (as a heavier power supply, videocard, memory etc.)(see my list above).
* Update (or downgrade!) BIOS (I had 0403 and tried all up to the current 0703 on my P5KR).
* CMOS clear / reset (remove battery, set jumper for 5 mins, reset jumper, add battery) and/or replace battery.
* BIOS default settings.
* All BIOS settings on manual, or underclock memory (DDR2-667) or up the voltages (DRAM Voltage 1.8 to 2.0 or 2.2 volt (at your own risk!!!)).
* Test memory (MemTest86+)(whole night, both strips were 100% ok) and CPU (Prime etc.)(whole night, CPU is perfect).
* RMA the motherboard or repair it (I had a P5K with the problem, but my new P5KR shows exactly the same problems).
Results:
After having tried all (list above: Solutions) with all kinds of parts (list above: My config), I isolated the problem to the following.
The board only boots when the CMOS is just cleared and there is only 1 strip of memory installed. From then on the system will boot sometimes, sometimes it won't and sometimes even when you add another stick of RAM.
Dual channel seems to make the problems even worse, as well as the temperature (warm booting seems better).
Conclusion:
The Intel P35 chipset is very hard to satisfy and boot and is very very picky on its memory, specifically the Asus P5K series!
Problem boards only boot after a CMOS clear and with some types of memory, 1 stick installed.
I really hope future BIOS updates will solve the annoying and amateuristic problems on these motherboards, because the problems seem to be softwarematic.
Large amounts of RMA's point on a big problem, and I hope I can keep my 2 boards instead of join the big P5K RMA community.
Please join this topic if you recognise this as being your problem, or if you have additions, work-arounds or even solutions!
Thanks!
The problem:
The motherboard wont boot or post, or it will but very random or under very strange and specific conditions.
All fans will spin (and keep spinning), all LEDs are on, all disks and USB devices go on but you just don't get error codes (BIOS beeps) or video. With memory removed it sometimes will give the memory beeps though.
Heat and memory seem to make the difference as cold systems tend to have the problem as well as boards with more than one strip of memory installed or with exotic RAM modules.
This problem is everywhere known as the P5K (or P35) 'No post problem' or 'No / cold boot issue'.
IF the board boots, the system is very stable, stays on and is stressable and solid as a rock.
Research done:
For almost two weeks I've read almost hundred threads on forums (e.g. TomsHardware, Asus etc.) and I replaced all components and tried numerous configurations and settings etc.
My personal config:
Asus P5KR rev. 1.02G (or P5K rev. 1.02G), C2D E6750, GeIL Dragon 2 x 1GB DDR2 (or Kingston 2 x 1GB, which is on the Qualified Vendor List QVL), Ati HD3870 PCIe (or Ati X300 PCIe), Coolermaster Extreme Power 450W, Zalman 7700 AlCu.
Standard solutions (all tried of course!):
* Remove all components but CPU and try to get error beeps (works after CMOS clear).
* Remove all components but CPU, RAM and video and start to add from there.
* Replace all components by others (as a heavier power supply, videocard, memory etc.)(see my list above).
* Update (or downgrade!) BIOS (I had 0403 and tried all up to the current 0703 on my P5KR).
* CMOS clear / reset (remove battery, set jumper for 5 mins, reset jumper, add battery) and/or replace battery.
* BIOS default settings.
* All BIOS settings on manual, or underclock memory (DDR2-667) or up the voltages (DRAM Voltage 1.8 to 2.0 or 2.2 volt (at your own risk!!!)).
* Test memory (MemTest86+)(whole night, both strips were 100% ok) and CPU (Prime etc.)(whole night, CPU is perfect).
* RMA the motherboard or repair it (I had a P5K with the problem, but my new P5KR shows exactly the same problems).
Results:
After having tried all (list above: Solutions) with all kinds of parts (list above: My config), I isolated the problem to the following.
The board only boots when the CMOS is just cleared and there is only 1 strip of memory installed. From then on the system will boot sometimes, sometimes it won't and sometimes even when you add another stick of RAM.
Dual channel seems to make the problems even worse, as well as the temperature (warm booting seems better).
Conclusion:
The Intel P35 chipset is very hard to satisfy and boot and is very very picky on its memory, specifically the Asus P5K series!
Problem boards only boot after a CMOS clear and with some types of memory, 1 stick installed.
I really hope future BIOS updates will solve the annoying and amateuristic problems on these motherboards, because the problems seem to be softwarematic.
Large amounts of RMA's point on a big problem, and I hope I can keep my 2 boards instead of join the big P5K RMA community.
Please join this topic if you recognise this as being your problem, or if you have additions, work-arounds or even solutions!
Thanks!