Question about HP Pavilion 505n (DC470A#ABA) PC Desktop

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No Post after Cmos Reset

So i inherited a HP 505n from a guy at work that bought new, the main board is as follows: mso 9]> Normal 0 MicrosoftInternetExplorer4 mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";}@page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;}div.Section1 {page:Section1;}--> mso 10]> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";}imperial-gl-ve 20021218 (Proc slot read foxcon).

So fix things fix i want to install windows so i formatted a drive in my main pc the drop it in, the 505n bios does not see it (though it sees the cdrw fine) but the setup disk seems to and asks where i want windows, so i choose the only partion available that was just formatted (WD 120 gb ntfs). It runs its "copying files for setup" cycle reboots and reasks where i want windows...strange, so then i let it format the space for the second go and get the same formats, copies setup files, reboots and ask what partion i want to use.

At this point I am not understanding whats happening...Google tells me a cmos reset may cure my ills, so i pull the battery (as i do not see a jumper) and disconect the power supply wait about 5 min replace the battery and cable and no post. The PC now turns on for a few seconds does not post then turns off, seems to me like it may be a short so i pull all the hardware and run the board on my static mat (no pc case), same result.

Further Google searches tell me that had i erased the partions and let windows decide how large they should be it could have saved me before the cmos reset. All i can think is that HP put in some funky **** in this PC so it will only recognize the parts they tell it to, but that gives me no clue how to repair it.

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  • zeroknown Nov 09, 2008

    I should have mentioned i tried both a 20 maxtor and the 120 WD neither were seen on either IDE thought both a CDrw and DVD rom were seen on both in series or alone. Regardless of of if i had one or two drive on the ribbon master and slave set or cable select no hard drive would be seen by the bios.

  • zeroknown Nov 09, 2008

    Oh, i also tried multiple cables.

  • zeroknown Nov 12, 2008

    I checked the drives, the 20GB was 5400. I have thought about flashing the bios but if the board will not stay powered how can i hope to flash it?



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Referring back to your comment about the bios not seeing the new drive. If the drive is not seen and setup continues to start at the beginning then there is either a compatibility issue or a connection issue. check your cables on the drive and on the motherboard. reinsert them to ensure proper orientation and stable connection and try again. If drive is still not seen then it is probably a drive compatibility issue. However, just to make sure, try switching hard drives to see if a different drive works on the same port. If it does then it is definitely compatibility, but if not then it could be a bad port on the motherboard.

Let me know whether any of this works.

Posted on Nov 09, 2008

  • Mark Kessler Nov 09, 2008

    Was one of these drives the original for that computer, if not do you have the original?

    The original specs for the hard drive are that it is a 60 GB Ultra DMA, 5400 rpm. If you are trying to use 7200 rpm hard drives, this might be causing the problem. You may need to flash the bios (Upgrade to latest version) in order to detect the 7200 rpm drives.

    Below is a link where you can find additional links for product information and driver downloads. In the driver download section there is an update for the bios. If you click on that selection there is also step by step instructions on how to install. There is another download for a firmware upgrade, (last on list under firmware), for the hard drive dealing with»

  • Mark Kessler Nov 20, 2008

    I guess I overlooked your comment about how the computer fires up for a few seconds then shuts back down. Have you thought about replacing the power supply? If you have another computer, even if the power supply from the other computer does not fit in the space, at least hook it up and try turning the computer on. If the board stays powered up, see if the hard drive is recognized. If the hard drive is recognized with the alternate power supply, then the problem is most likely caused by the old power supply not powering up the system adequately.



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