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Dell 5150 :: Tipped over sideways :: Will not boot up as normal :: Blinking lights :: Monitor shows nothing

Hello,

Our PC tipped over sideways.

After picking it back up, powered it up as normal, nothing would display on the monitor. Here are the symptoms and also things we did to attempt to correct the problem:

PC Type: Dell 5150
OS: Win XP Home

SYMPTOMS:
-- Solid green light on motherboard (when powered on)
-- Power button light on front was flashing steady for a while, but no longer on boot up

WHAT WE DID:
-- Checked all video card and external monitor and connections to ensure everything was snug

Does anyone have any idea what the problem could be or the next place to start on this?
 

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w3developing
Asked:
w3developing
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1 Solution
 
SappbrostsCommented:
probably shorted the motherboard to the case, try another motherboard
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dbruntonCommented:
I doubt that the motherboard has shorted.

You'd open the case and check all internal connections.  It may pay to disconnect and reconnect the connections to make sure they are firm.  Check the hard drive connections especially.  Check at both motherboard and hard disk.

If there is a video card in the machine remove it and then reseat it.  Remove memory chips and wipe dust off them.  Blow out memory slots and then reseat the memory chips.

Reboot and retry.
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☠ MASQ ☠Commented:
Are you getting any noise from the PC when you switch on? Fans? Drives? Anything beeping?
On the back of the machine there should be four green LEDS, are any of them on?
There's a chart here that might help if they are:
http://support.dell.com/support/edocs/systems/dim5150/en/sm/tshoot1.htm#wp1120147
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nobusCommented:
check also the power connections.
start the pc with the case open; are the fans running ?
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w3developingAuthor Commented:
I removed everything from the motherboard, unplugged and replugged all the cables on the motherboard, plugged the power back in and tried the power button on the front, absolutely nothing happens - no fans, no harddrive activity, nothing.  When I first noticed it had fallen over, then single green light in the power button on the front was blinking slowly, about 1/2 second intervals.  After unplugging the power cord from the back of the box and plugging it back in, it has not blinked since.  No noises from the box at any time.  I know it is getting power to the motherboard because when I plug the cord into the back, I get a green light on the motherboard.
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nobusCommented:
Here my troubleshooting procedure :
clean the system from dust, then  test with the minimum setup - disconnect also all peripherals and network cables :
motherboard + cpu + 1 ram stick, video card, power supply
verify that the 4-pin cpu Aux power plug is connected
on boot, do you have a display?
if NO it is one of the connected, swap ram, Power supply, video card or monitor - leaving only motherboard and cpu
if Yes, add devices till the problem shows

you can also check the motherboard for bad capacitors as shown here :   www.badcaps.net
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dbruntonCommented:
I would borrow another known to work power supply and plug that into this computer.

You don't have to screw it to the computer.  Sit it on top of the box and try it.

That'll definitely confirm the validity of the power supply.  Once that's determined then look at the other components.

Also check that the on/off connection from the computer button cable is connected properly to the motherboard - just in case it has come loose.
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w3developingAuthor Commented:
I was thinking, it seems like there is no response from the front panel because there is power to the box but no response from the front power button and no diag lights.  I remember seeing an empty plug-in on the front panel circuit board, but dont remember seeing an unplugged cord in the area.  I will check when I get back, but should the board for the front panel have one just the ribbon cable plugged in or should there be another?
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dbruntonCommented:
Front power button may have become disconnected; either at the button or at the motherboard.  You can jumper at the motherboard connection to see if it starts.

I think this is your manual. http://support.dell.com/support/edocs/systems/dim5150/en/om/WD846A02.pdf
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w3developingAuthor Commented:
dbrunton, I like the sound of your suggestion but I cant find how to do it.  I looked through the user manual from your link (yes that is the correct manual) but could not find any jumping info.  I search on the net and found anote about jumping the green and a black wire on the power supply, which I did and the fans came on, which I believe means the power supply is okay.
I have suspected something with the front panel the whole time, so if you could be so kind as to tell me how to jump the power switch or point me to a link, that would be super.  Thank you all for your expertise.
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dbruntonCommented:
I've looked at the manual just now.

That's not a pretty ribbon connector to the front panel to look at.  It seems to be proprietary to Dell.

I haven't been able to find anything that refers specifically to that cable.

Your best bet is to remove the cover off the front case to get at the electrics there.  The manual unfortunately does not show how so you'll have to look for locking screws and tabs.  Once undone check and see if there is a connector there that it is pushed home and see if you can access the on/off button and temporarily short the connection to start it.
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Danny ChildIT ManagerCommented:
has the CPU been reseated? - they can bounce out if a case topples over.   Just FIRMLY push it back into place.

This may be more info on the cable as mentioned by dbrunton - 2nd time I've used this link in 5 mins!
http://www.lnmdesign.com/400sc/front_pnl.html
My money's on pins 19 and 20 - see the FNT_PNL section

hth, Danny
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nobusCommented:
luckyli i measured it out once :  pwr on connection for D'll :
Dell-Power-on.doc
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SappbrostsCommented:
I still think the MB shorted
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w3developingAuthor Commented:
Well, I tested the power supply and I think I jumper the power switch and it still wont power up, so it looks like you guys were right, failed motherboard.  Oh well, thank you for your input.
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w3developingAuthor Commented:
The question is closed, I gave the points to dbrunton because I felt his comments were the most helpful in guiding me to the answer.  So, even though a failed motherboard had always seemed the best answer, I had wanted to test everything first.
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nobusCommented:
my troubleshooting procedure - if followed- would show the bad component
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