Question about HP Pavilion a800n (PP163AA) PC Desktop
I have tried a different graphics card,changed the cmos battery,reset the psswrd,reset the cmos....nothing ..the fans are running...lights are on...but no power is going to the moniter.I have tried two moniters,unhooked the hd to see if I could get into the bios...but nothing..it's like it's dead the only beep I can get is when I removed the ram and didn't insert it all the way then I got one long beep after another...can anyone suggest another tactic to try???????????help!!!!
much trial-and-error, I finally figured out the solution for this
common issue with certain HP Pavillion models. It turns out to be a
design flaw with the front-panel memory card
reader. Somehow the card reader's firmware gets scrambled, and it
prevents the computer from booting. You can test this on your machine
by temporarily disconnecting the card reader cable at the motherboard header. Voila - I'll bet you $1 that your computer will now boot!
The solution is buried deep inside this HP tech support document. The card reader firmware needs to be reset.
Here\'s how to fix it once and for all:
1) With the computer power unplugged (duh), open up the case & disconnect the card reader cable at the card reader itself - NOT the end that connects to the motherboard header. Make sure the cable end is not touching any metal components before proceeding to step 2 (another duh).
2) With the cable still disconnected, fire up the computer. The tech support doc says to let it boot into Windows and stay there for about 5 minutes.
3) Shut the computer down and reconnect the cable to the card reader.
4) Turn your computer back on - your memory card reader will work and, most importantly, the computer will no longer hang at POST!
I suspect that when you fire up the computer without the cable connected, the card reader is designed to reset its firmware by grounding out through the case - sort of like a CMOS Reset jumper on a motherboard.
I hope this solution is helpful to others.
Posted on Mar 28, 2009
Chechk with powersuply and that it is properly connected to the motherboard
Posted on Oct 31, 2007
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Posted on Jan 02, 2017
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