Question about ASUS P4P800-MX Motherboard

1 Answer

No video or boot. Nspire with P4P-800MX

Had a power outage, now when I try to boot my Nspire with P4P800-MX motherboard, screen in full of red & grey "Matrix" type of characters on screen. Tried installing PCI VGA card, but nothing comes up on that at all. Not sure if PCI was even enabled in bios. PLEASE to dont tell me to disable on-board video in BIOS, cant even GET to BIOS. At a loss of what to try next. Thought there might be a jumper to disable on-board video, but cant find and info in documentation.

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  • Jim Couk Jan 07, 2013

    Would it help anyone if I posted a pic of the screen?



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  • 3,606 Answers

Hello try to download the manual here:

Please select your windows system.
Next open the manual folder, and click on global for download.
You will need adobe reader, to read the content.

The problem could be the power supply failing, or bad capasitors on the mainboard:

No video or boot.  Nspire with P4P-800MX - 1_9_2013_3_35_28_pm.jpg

If the problem did not occur before the power outrage, i suspect the power supply failing.

If you change the power supply, take antistatic precautions when working on the mainboard.

Good luck

Posted on Jan 09, 2013

  • Jim Couk Jan 10, 2013

    Upon further review... My wife said it showed some "weird things" on the screen before the power outage, but she would restart the system and it would be fine. As soon as I can, will look at capacitors then replace power supply if those look OK, then let you know. Appreciate the help!

  • Jim Couk Jan 18, 2013

    Yup yup found def signs of capasitor issues on the board. Oh well, on to Craigslist to find another comp. Thanks for your help on this!



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Posted on Jan 02, 2017

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SOURCE: I cannot enable the on board sound card(sound Max)

check the driver status of your sound , in the device manager, if its not installed , then install the drivers or if your sound is not detecting then
go to the BIOS and load optimized bios default settings then check

Posted on Nov 20, 2008

SOURCE: PCI-E recognition issue on intial start up ASUS P5GC-MX/1333

To solve this problem you have to do the following things in the series.

first remove all the extra cards and then connect to the onboard vga connector. then start the sys and go to bios settings. if you know the advanced adjustments then
correct them as follows. otherwise just select load optimized settings.

first go to the video card selection in advanced
and then set the setting to pci/pciinternal or pciint/pci ext

then set the pallette snooping to yes.
shutdown system

place graphics card and then donot change any setting. then you'll get the display.

i have the same motherboard and i also faced this once. it is not a problem it is just misconfiguration.

Posted on Apr 22, 2009

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SOURCE: pci express will not work


Posted on Nov 13, 2009

  • 84 Answers

SOURCE: I have a P5GC-MX 1333, I have an nvidia graphics

Internal video and AGP / PCI Express video cards use the same "pipeline" so you can only use one or the other, not both.

If you need additional video ports, you HAVE to get additional cards / a video card with multiple video ports.

Posted on Apr 09, 2010

  • 1400 Answers

SOURCE: asus p4p800-se. press power and

Weird problem here.By taking out the cmos battery your reseting the mobo bios back to factory settings.
How is the processor? Heat possible problem.I say this beacause you say you wait 24 hours.

Unplug pc.Remove processor heat sink and fan,take note of thermal paste between heat sink and top of processor,you may need to wipe paste clean with a paper towell and repaste,do not put alot on.Also check fan and heat sink fins for dirt dust,clean if nessasary.

Here is a link for your manual.

Next remove and reset the memory sticks be sure they are in firm and tight.
Once this is done try rebooting the pc.Hold down the del key while booting up and see if you can get into the bios once there refer back to the above manual link and set up your bios.

Here is another trouble shooting link from asus,relates to your problem,have a look.

Posted on Jan 20, 2011

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1 Answer

Twice beep sound is coming. Booting is not happening for my p4p800 mx/s board

Hello !
If you check out ASUS support, you will find this troubleshooter for the motherboard not booting :
1. Please clear CMOS.
2. Please take out your memory cards and video card, try to clean their golden connectors with a rubber, then reseat them back.
3. Please take the CPU cooler out, add some thermal paste to the CPU surface, then reseat the cooler back and keep the cooler tightly installed.
4. Please keep the necessary components(CPU, one memory) onboard for a test.
Finally, we would recommend you to replace a BIOS battery to have a test.
Also, by looking over beep codes I have found for AMI BIOS these problems for the 2 short beeps :
1. Memory parity error (Description : A memory parity error has occured in the first 64 KB of RAM. The RAM IC is probably bad).
2. POST fail (Description : One of the hardware tests have failed).
If you have done those and it still doesn't boot, let me know I'll try to find other solutions.
All the best !

Aug 03, 2011 | ASUS P4P800-MX Motherboard

1 Answer

P4P800-mx motherboard. Powers up fine, no beep codes no video. Does send signal to monitor that it is there.

pulls out the memory, video card and also check all wires to ensure that they are in the correct places and seated correctly. Also if this is an system thats been around awhile clean the dust out. I just had the same problem because of dust.

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I have read somewhere that the P4P-800E motherboard has incompatibilities with Windows 7 however the upgrade advisor showed no problem. Is this true.

you can install win7 but some hardware may not can fixed it by upgrading the bother board bios firmware..
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Motherboard power is on but cannot display screen, the monitor is black or no screen.

your problem could be almost any of your hardware components
the best way to detirmine wich one/how to fix it is with a process of illimination. You should do this by switching your hardware components with known good ones.
being a display problem the order i would test with is this.
  1. disconect everything but the screen
  2. swap screen for a known good one
  3. disconect graphics card and try the onboard (if no onboard try another gc)
  4. test psu (power supply unit) this can be done with either a psu tester, multimitre or try with another psu
  5. try removing all your RAM, when you boot if your system beeps a couple of times you know that your motherboardand cpu are good. if it doesnt beep it is probably your motherboard or cpu.

Oct 14, 2009 | ASUS P4P800-MX Motherboard

1 Answer


can you try check what the bios settings for lpt1 are first?
You should have SPP or standard / ECP or EPP etc.

To flash your bios you will have to download the new bios and the flash utility from here for your model:

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Won't boot from dvd drive

After you turn on the computer keep pressing the f8 key momentarly until the boot device select screen appears then use the up and down arrow keys to select the DVD drive. The computer will then boot from the DVD drive as long as theres a disc in there.

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Make sure that the right video source is selected in BIOS.

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