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Older computer won't POST after HD replaced?!?

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  1. EdNerd

    EdNerd Well-Known Member

    This is an HP Pavilion 511n. The hard drive went bad and needed to be replaced (especially after I dropped it and it started making ticking and scraping noises!).

    Okay - finally got a new HD installed. Now the machine won't boot, POST, do nuttin'!! I plug in the power cord, and I get green lights from the motherboard and power supply, and the fans on the CPU and PS both start running. But the power button is useless and the BIOS doesn't start, and nothing shows on the monitor. No system beeps, but I don't see a speaker either.

    I'm thinking maybe I've unplugged a cable from the MB?? (Asus TUW-LA) I 've reseated both RAM modules and tried it with both on-board video and the installed card -- no go.

    Any help or hope?

  2. lunatic59

    lunatic59 Moderati ergo sum Moderator

    Unplug the new hard drive and see if you get to POST with the "operating system not found" error.
  3. Mayhem

    Mayhem Well-Known Member Contributor

    I'd also suggest re-seating the RAM. If you dropped the whole computer there's a good chance that one or more of the RAM sticks got jarred loose.
  4. EdNerd

    EdNerd Well-Known Member

    Didn't drop the whole 'puter - just the drive (don't ask - long story). RAM already reseated. Hard drive unplugged.

    No POST, no display, nothing except fans and lights.

  5. lunatic59

    lunatic59 Moderati ergo sum Moderator

    Okay, try this. Remove the RAM and try to boot. You should get the beep error code for missing RAM.
  6. argedion

    argedion The TechnoFrog Moderator

    if you have the old hard drive try putting that in there and see if what you get.
  7. EdNerd

    EdNerd Well-Known Member

    Nothing I do produces any beeps. New drive (no OS installed) or old drive or no drive, RAM or not - plug cord into power supply and get LEDs and fans. Period. No video display either.

    I can't find a diagram or photo of what this should look like all plugged in, so I just wonder if I didn't accidentally pop a plug off the MB - or deliberately to get clearance for something - and don't remember what it was or where it goes.

    With fingers crossed ---
  8. argedion

    argedion The TechnoFrog Moderator

    maybe check some hp forums and talk to some of the people over there. maybe hp themselves. I got the same kind of thing with a compaq but since its old and I have other computers I haven't bothered with it.
  9. cursor system

    cursor system Member

    The best to do is to take the hard disk that you remove from the system to the computer store for its replica. Old system to New system accessories. There a lot of changes in motherboard configurations. the Old system can not pass HCL(hardware Comptibility List) of the new HD
  10. SUroot

    SUroot Well-Known Member Developer

    To neither sounds like something is unplugged or the psu has started to fail.

    Double check all the power cables are connected properly.
  11. EdNerd

    EdNerd Well-Known Member

    That's what I'd love to do.
    But I can't find a diagram that shows where everything goes.
    I've got a P8 and a P4 plug that look like they belong somewhere.
    But no idea where!?

  12. Kruncha

    Kruncha Well-Known Member

    Is the only thing you changed the harddrive?

    A motherboard on it's own should produce a POST errror regardless of what is plugged in to it, if something important is amiss.

  13. EdNerd

    EdNerd Well-Known Member

    The only thing I changed is the hard drive. Technically speaking ....

    However (yes, that's a scary word!), while trying to get the failing hard drive to work prior to buying the new one, I swapped another hard drive from another computer in and out. I also unplugged my video card from the MB, thinking that might cause problems if it wasn't recognized by the other HD. And I pulled out the floppy drive because it's not used any more.

    So, failing to note what was plugged in where before I started, I have no idea if the current problems are just because I left something unplugged - or because I've fried my MB!

    Also, I don't see a speaker anywhere in there. But there is this little pinkie-sized "buzzer" in the corner of the MB. Is that the thing that should "beep" the error codes? And what's causing the fans to kick on as soon as I conenct the power cord to the power supply?

  14. SUroot

    SUroot Well-Known Member Developer

    Unless whats not plugged in is power.... Which was my point.

    OP, not everything from the PSU has a home.
  15. SUroot

    SUroot Well-Known Member Developer

    Usually when I have the issue where the Mobo fans (not PSU fans) kick in, its a faulty PSU. Sometimes its a faulty Mobo. I suspect the mobo isnt getting enough power to run. However, its all a hunch with no real evidence to back it up
  16. lunatic59

    lunatic59 Moderati ergo sum Moderator

    Is this your motherboard?
  17. EdNerd

    EdNerd Well-Known Member

    Yes. I've seen that page and diagram.

    What I was kinda hoping for were instructions like "if you are replacing it, this plugs in here and that plugs in there". For instance, there are empty jacks in the upper right under the CMOS battery, lower center under the 810e and left of the RAM sockets, and the AUX jack at the bottom edge towards the left. Should these have power plugs (or other stuff) in them?

    Or something for the plugs coming out of the power supply:
    P1 is for this
    P2 is for this
    Although I imagine that would be a separate part number and configuration to look up.

    I even tried to clear the CMOS at the CLRRTC solder points - but I couldn't see if they were 1-2-3 left-to-right or right-to-left as I'm looking at the MB.

    Sorry to be so clueless about all of this.

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