7800p x64 missing drivers – FINALLY solved

If you’re in rush, the drivers are near the bottom of this post. But first, my life story… Here’s a little note to myself, regarding an issue with this model: do not even try to install Windows 7 Ultimate on one of these damned things. It will install, but on reboot it will display the HP, BIOS splash screen and go to a black screen – period. If you hold the power button in, or unplug it, it will boot properly again – but that’s a pretty unworkable set up. In other words, with some screwing around, it will boot every other time (if you unplug the thing after each use!). I find it odd that the “Windows 7 Professional” version works fine – I would have presumed that the various versions of Windows 7 were all pretty much the same in terms of hardware compatibility. Hey – the HP site got one thing right, anyway…. Argh – there goes 5 hours of my dwindling life, again.


  • Fix the same damned problem on a 7900e
  • Redhat 5.x, or Centos 5.x, runs HORRIBLY on a 7700 or 7800 – SOLVED.

[hana-code-insert name=’AdSense’ /]

Anyway, I don’t wanna lose this stuff. I spent hours trying to get the device drivers “right” on an HP dc7800p, 64-bit computer with Windows 7. When the install was finished most of the drivers were installed, with the exception of two. The missing drivers were for a PCI Simple Communications Device and something else – an “Unknown PCI device” of some kind. I can’t recall exactly what it said. I followed a dead-end trail of conflicting directions for half a day. I need to test everything one more time, but, this is what eventually worked.

UPDATE: I’ve tested this 3 times – it works perfectly.

A couple of the steps, below, had nothing to do with the two “mystery” drivers – one is a chipset update, from Intel, and one is an update to the ethernet driver. But this was such a flippin’ headache – and I tried so damned many things before this worked – that I’m going to follow this routine…because I’m crazy, I suppose. If anyone else uses this page: as I’ve just noted, the chipset and ethernet drivers are just optional upgrades – do whatever makes you happy.

Anyway, here is the routine I followed which worked…and, as I’ve said, it includes two completely optional upgrades (the ethernet and chipset things….):

Driver Downloads

  1. Download this HECI driver-deal and install it..
  2. Download this ethernet driver update and install the thing….
  3. Download this chipset update and install it
  4. Download this LMS_SOL (shit outta luck? – almost) driver.
  5. Bada-boom, bada-bing….it works!

9 thoughts on “7800p x64 missing drivers – FINALLY solved

  1. Carl February 16, 2012 at 2:13 am

    I’ve been chasing my tail for hours trying to find the right drivers and the above HECI and LMS_SOL versions worked to solve my missing driver issues in my HP DC7800. Thank you again for the solutions I was looking for.

  2. admin February 16, 2012 at 3:19 am

    I’m glad it helped….. This is where I park a really odd collection of things that, otherwise, I would lose. Yep – this thing was a pain in the neck, that’s for sure. And, as I’d noted, I’m sure that the ethernet update is of zero relevance. But, after jerking with it for hours, I figured, “What the hell….?”. I wanted to make sure that EVERYTHING was working. Again, glad you found it useful.

  3. neil March 25, 2012 at 5:46 am

    I am no computer geek , and I get so tired of this crap every time I have to F with a computer . Like a dog with a bone , I don’t give up until I am done . Thank god the cure was found .It worked for me . Saved me hours of pain in the trenches of just trying to make the damn thing work right.For the record my machine is the dc7800s ( small form factor ) Thank you …. thank you …. thank you …..May you win the lotto : )

  4. admin March 25, 2012 at 4:32 pm

    Cool deal, Neil. I dunno why these damned things aren’t on the HP site, listed with the drivers for this model. And on the forum, there, I found a bunch of marginally helpful directions – messed with this for hours until it finally worked. Just glad it helped. Thanks for posting your specific model, too.

  5. Rob May 8, 2012 at 6:29 pm

    Thanx Guy!
    This method solved the PCI problem on my dc7800 SFF as well! But I have an other issue with the audio driver… (OS: WIN 7 Professional) I simply cannot install the driver which is published on HP’s official website. Any suggestion?
    thank you

    1. admin May 8, 2012 at 7:26 pm

      Hey Rob…. I edited your post, I’m Guy…lol – not Neil. Anyway: man, I have no idea about the audio drivers. The ones on HP’s site worked for me, as I recall….. Actually, I think that they were working when Windows 7 was finished installing – heck, I can’t recall. I know this: HP’s site leaves a bit to be desired in terms of really getting all of the drivers for some of these units. If I had a clue I’d help – but I don’t even have one of those units in stock, now.

  6. Jeff May 14, 2012 at 1:53 pm

    You can try sp50589.exe, that one worked for me…

  7. Jeff May 14, 2012 at 1:57 pm

    Sorry, my above post is incorrect, here is the driver that worked for me…


  8. mike May 25, 2012 at 4:57 am

    I have been working and searching for this solution for over a month. WORKS !!!

    Thanks. Now i can sleep….

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