Oh yes I had exactly the same pronlem. It turned out the problem was the RAM.
It looks like your RAM is designed to run at 1.65v is it not ? So was mine, it was a OCZ platinum 1333 cl7.
Problem is our board only support 1.5v
I fixed the problem by buying one in the list of supported ram from Intel site.
I went for a Kingston KVR1333D3N9K2/4G and it's now working perfectly.
In my motherboard box there was a yellow paper saying that a future revision of the board will support memory voltage override. My board revision is 204, if your is higher and there was not such a yellow paper in your box, you might wait until a BIOS update will enable the feature.
If you really are desperate about hanging on to your RAM, you might still try to change the SPD timings of the modules.
I set up a wiki giving some hints about it, but it's not a very easy or safe operation, I don't know how to do it with Windows (I only use Linux), and at the end it didn't fix the problem for me.
Here is the link anyway: https://wiki.ubuntu.com/Intel_DH55TC
The whole issue of memory timings (cl7 cl8 and so on) is all about making money out of people's paranoia for getting higher performance and having a module with a good looking heat-spreader.
The modules I have now have the bare chips without any heat spreader, and they barely get warm to the touch, it's mostly about marketing, believe me.
Memory timings don't make any noticeable difference, read some benchmarks over the net.
Go for stability, and get one officially supported by your board, or at least one tested for 1.5v
thanks for the hint.
today i went to the hardware store and replaced the ram against "corsair ddr3-ram kit 4gb d3qc1f" thats powered with 1.5V. then at home i build in the ram powered on and it works, then i shut down the station. after 15minutes i started the workstation and i have the same problem again :-(
after ~7 power on and poweroff's the pc starts normale !!!
whats next, what can now be the problem?
Your graphic card is quite powerfull, 58w at full load. Is you power supplier powerful enough ? It should be at least 400W or so.
Also, don't try any overclocking for the moment.
It could also be something wrong with the graphic card. Remove the graphic card and connect the monitor to the video connector on the motherboard itself.
It should work because the i3 has integrated graphic, even if much less powerful than the zotac.
Try and let me know how it goes. If the problem goes away it means the problem is the graphic card.
the powersupply has 500W. yesterday i tested another idea, i turned the clockspeed from automatic to manual and make no changes on the frequency so it runs in normal speed (no overclocking). after this change i do 5 reboots in the last 21 hours with no problem.
lets see if this configurations works, when not i test your hint with the graphiccard.
i had a similar problem with my intel dp45sg mainboard that reboots sometimes without any warning. to solve this i had to turn the ram frequency from 1333 to 1066 (http://communities.intel.com/message/32957)
bad news. i have the same problem again also after removing the graphiccard and use the onboard one.
I recommend to try a different power supply, you may be having issues with the standby steady line +5v.
Also, your processor ha a built in graphics controller, test your system on a very basic configuration and use the on board graphics. Take your video card out.
If you noticed that the problem gets fixed when you take the optical drive, you may have a compatibility problem there and you may contact the manufacturer of the unit and request a firmware upgrade.
I had the same problem before after lot of reading I figured out this OCZ DDR 3
Causing the problem on after ever restart or reboot.
Now I changed my ddr3 with this one …
Model # Corsair TW3X4G1333C9A and working everything fine smooth.J
thanks for the hint but i can't return the ram again to my hardwarestore.
first i build in the kingston ram with 1.65v (posts above). then i replaced it with "corsair ddr3-ram kit 4gb d3qc1f" that have 1.5v. when i now go back to my hardwarereseller and ask for change again maybe he locked me in a psychiatry.
the next step is to buy a new powersupply for ~80€ :°( i hope that these help finally
Before you spend more money, follow my suggestion to test the motherboard out of the chassis and on a basic configuration. This can give you an idea of the problem and maybe save you that money.
so now i did this:
- replaced the powersupply = no difference !!!
- tested both powersupplies with an testern -> all voltages are correct
- walked again to the store and they only replaced the board against a board of the same type, build it in = no difference !!!
i tested these only with basic config: board, powersupply, ram, cpu
its really exhausting :-(
Gregor, can you describe again exactly what the problem is, so that we are sure it's not a software problem ?
you are kidding me?
pls read the above posts. why it should be a software problem when the damn mainboard didn't come only to the bios
sry im really angry with these intel mainboards
how can i lower the "host clock frequenzy" under the performance tab in the bios?
in the field are 133mhz but when i enter other values and press enter it always changed it back to 133
You can't run it lower than 133, you can only run it higher, but that cannot be the problem. Have you tried the BIOS Configuration Jumper Block ? It's a jumper in the motherboard. According to the manual, by removing the yellow cap, you set the board in 'recovery' mode, that should be to recover in case there is some serious problem.
I wanted to know more about your problem. It looks like you are able to switch it on and get to the BIOS settings. Have you been able to boot any operating system ? In the original post you said you have problems only after it has been off for a while. How long is that time ? Does it always work when you restart it ? How well it works when it is working ? When it doesn't work (after it's been off a long time) what exactly happens ? Does anything come up on the screen ? Maybe describing the problem more precisely could give somebody a clue of what is wrong. Also: have you tried to run Memtest86+ (www.memtest.org) ?