I'm building a new system with the following
Asus P4P800 E Deluxe MB
Intel P4 3.0 Ghz, 800 FSB Processor
1GB Dual Channel Memory PC3200 DDR400
80 GB WD hard drive
Asus 9250 128MB DDR AGP 8X Video Card
380W Antec Power Supply

Here's the problem...
Hooked everything up, powered on, got nothing. No beeps... Motherboard light is green. Push the power button and it lights for a second. Nothing, not even the fans startup.

The strange thing.... Just happened to unhook the 4 pin power connection during troubleshooting... when I do that the fans run but still no beeps, no hard drive boot, nothing to the monitor, nothing to the CD drive.

Any ideas? Please, please help, I've called Asus and the tech service there leaves alot to be desired. I have a bad feeling it's a bad motherboard. I hooked in a different power supply, same issue.

Is your 3.0ghz a prescott or northwood processor. I believe the P4P800 series motherboards aren't compatible with the Prescotts until the bios is updated. Ummm.... you can try this try running only one stick of ram on the third ram slot. Clear cmos and see if it powers up. That's all I've got sorry. Good luck!

Hmmm, Asus again? Im so sick of ASUS problems. Sorry, i cant help u at all, but i have an advice for ya, next time..... STAY AWAY FROM ASUS!!!!!

Thanks for the advice... the motherboard does support Prescott, my processor isn't Prescott though. I cleared the CMOS, moved the memory and still same.

I've built 2 other computers with Asus motherboards, never a problem... until now, I think I will stay away from them.

Ummm... make sure you plugged the LED control panel correctly. Haha sorry I can't really think of anything else.

I've done that 10 times, just in case

I had the exact same problem and it turned out to be the power supply.
You say you tried a different one. How powerful was it?
I bought a 400w PSU and all is now fine.

I have your same problem. I tried to replace the power supply but still with no success. Tried to clear the RTC but invian.
What I am noticing is that the memory controller get to hot just after 20secs of powering up the pc. Tried to remove ram but invain. Still with problem.

any suggestions?

First off, let me just say that there is absolutely nothing wrong with ASUS. Every company has put out a bad product every now and then. So, how is that any different when ASUS does it? I personally have used many motherboards from ASUS in the past and have never found them to be at fault for anything, except for the store where I purchased them from was carrying used, and defective returns.

Secondly, I too have the same motherboard and have been running it without a hitch for a number of years now, and yet to be honest I can't seem to decipher your problem in order to provide you with a solution. The gentlemen above me mentioned if you had a "Prescott" based P4 instead of a "Northwood". You said no. But, when I think about it, could it be? Not that I doubt your knowlege of computers or anything, but I only say this because there is a special pin located on the Prescotts that notifies the motherboard right away that you are indeed using a Prescott, and not a Northwood. I think you should download an updated BIOS (if you haven't already) from their website and flash your motherboard's BIOS to the latest revision. If this doesn't work, then report back to us with your results of what happened. Sorry if I wasn't of much help, but good luck anyways.

i have the same problem same mob when i connect 4 pin fans try to start yet when i unpluge it fans spin one rotition . wtf new power source. someone please help

Guys i had a very similar issue when trying to fix a relatives pc (with a : Asus P4P800-E Deluxe mobo).

check out the power supply unit and make sure there are no blown (or bulging) capacitors (from what you can see inside the grill). I found some brown goo over some of the circuitry after much investigation and buying of replacement parts!

The PSU (an arlec 'true330') seemed to work fine, eg powering up the peripherals and the fans and the mobo light but that was about it. In fact i put in an ASROCK mobo and it all seemed to work fine (so i though it must of been that i fried the mobo), but then after a few boots the same symptoms occured in the ASROCK mobo!

A pc vendor suggest i try a different PSU and sure enough what i thought was a blown ASROCK mobo then started working!

Thinking that possibly the ASUS mobo could be brought back to life, i'm afraid this wasn't to be.


For me it looks like the PSU became faulty and at some point took out the ASUS mobo. the strange thing is the faulty psu will still powerup an old PIII i have lying around (i haven't left it on for any length of time). Perhaps the socket 478s need more power?

At any rate, if you can get hold of a PSU testing device - it might help isolate the problem and save you a lot of leg work. (also make sure you have 2 x PSU plugs plugged into the mobo...which is a mistake some people slip up on).

If you done the above and still no, joy...i thinking its time to let the Asus P4P800 go and find another socket 478 mobo

Andy Magoo said:

I think the first clue was that the PSU name was trying to pass itself off as an Antec Truepower PSU. Clearly they thought people who had heard/read good things about Antec PSUs in general, might confuse their "Arlec" brand with "Antec".

Obvious attempt to not run afoul of counterfeit laws while producing a PSU that is likely a piece of ----.

Any time you see something branded to make it look like it's associated with something else (esp. namebrand items), it's usually not flattery that drives the deception.

I'd immediately replace any similarly deceptive hardware whenever I ran into it.

Wow, I have the exact same problem as described by Andy above. I am also working on a relatives system that seems to exactly match the above. I have tried multiple PSU units, one smaller than the antec 300 (if that really is what it is) and a brand new 400 watt from startech that my uncle bought to try and alleviate this issue. The board light does come on, and stay lit, but none of the fans will turn. I have pulled every device out of the system, including RAM and still no luck. I cannot find a burn or bulge anywhere on the board itself so I am kind of at a loss on what this could be.

If anyone has any ideas, I am open to suggestion.

This is a very late reply to your issue however I thought I would give it a shot. A BIOS update wont do the trick because you cant even boot to the CMOS. Here are the steps: First exclude the simplest things. Do each step one at a time and try your system after each step.
Test the power supply.
Test the RAM
Clear the CMOS according to manufactures recommendation, if this works you will have to go back into your CMOS after this step and reconfigure your settings.
The LED indicates the M/B is getting 5V standby is OK but otherwise the system is dead pretty well means you've got a short circuit or bad component somewhere. Commonly its a RAM module that's bad but if you have tested your RAM and its OK try positioning your RAM in a different RAM socket.
Test your CPU, they are generally very reliable and rarely fail.
Finally try reseating your CPU with fresh heat sink compound (paste). Asus has some fail safe features that are incorporated to protect the CPU from becoming damaged if overheated. If your paste is old or if it isn't transfering the heat from the CPU to the heatsink because it's lost its contact your system will shut down to protect the CPU. If you have tried all of the above without success you may have a faulty voltage regulator module on the M/B There is a Winbond W83627THF-A I/O controller chip that regulates some of the important functions, like fan speed, CPU voltage etc.. that can affect CPU temperature and hence can impact your system in the way you have described. There are other components such as capacitors closeby that also play a role in this. Fortunately Asus has an excellent warrenty that covers M/B issues so you don't have to be a tech to fix it just call Asus, request an RMA then send Asus the M/B and they will send you a replacement. Because Asus is such a large company you may have a bad experience with thier tech support. I have only had to call them a couple times over the last decade but have always found them helpful and easy to deal with. I hope everything works out for you.
Ted

I will agree with late reply, but I will say THANK YOU. Unfortunately this issue is basically done, but you offered extremely good ideas on what it could be. ASUS determined that the power modulator went bad. As you stated they had no issues with replacing the board and all is good.

Again, Thank you and I will definitely keep your reply, as others should, cause it was very sound advice.