I took my Laptop PC apart and now the CPU dont start...HELP!

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Joined: Aug 29 2007
Posts: 4

yo. I took my Laptop PC apart. now it does not power on. At all. It wont start with a charged battery or with power from the wall.

When I was taking it apart, I just took off the back and the monitor (flip top kinda off. Just disconnected the wires but I reconnected everything back perfectly.

The laptop is a HP Pavillion zv5000 with XP. My wife happens to have the same one, so I took my hard drive off and tried it on her PC and it worked fine. but then when I plug it into my pc it like tries to start up but it cant. I can hear it kinda try to spin, but then not. The lights all turn on normal on the keyboard but then the MONITOR doesnt turn on at all?

How do I figure out what the problem is? Is it the screen? I know its not the battery or the hard drive, cause Ive tested that on my wife's PC. What else could it be?

HELP! .... Smile

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coius's picture
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Joined: Aug 25 2004
Posts: 1975
check the cables

you might need to go back in. I suggest, if you can find someone that took it apart and has pics, look for that. I will see if I can get you a link of a take-apart on it to help you.

Have you reseated the RAM stick(s)? What about any other stuff (Wifi Card, etc...)? I hardly doubt it's the harddrive, and the fact that it spools up means the board is working somewhat.

is the CPU removable/on card? If it is, you might need to go into it and reseat it.

my first suggestion is RAM. clean the contacts on the RAM with a rubber eraser. That should take off any dirt on it. Be sure to make positive than any rubber residue is off the tabs on the RAM.

If that doesn't work, you might need to delve into the machine a bit more at the hardware level and just re-seat everything. Check cables, make sure they are snug. If the keyboard pops up (through tabs) or is removable easily (through screws) that would be the first place to start.

What were you doing that required going into your machine?

As comfortable as I am with a laptop and working on them, I would NEVER intentionally go into one unless it is having problems. I hope you weren't going in just for a casual browsing...

see if this helps:
HP Pavilion ze5400 Dismantle

The laptop may be different, but the concept is the same. as you delve in, you will notice the similarities. Just be sure you get every screw in that you took out.

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coius's picture
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Joined: Aug 25 2004
Posts: 1975
EDIT (again)

I just got a ZD8000 today that I am working on. Has the same problem. I have come to the conclusion that the motherboard needs to be replaced. Sorry, looks like you did something you shouldn't have done. Now you gotta get a new motherboard

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Joined: Aug 29 2007
Posts: 4
R U SERIOUS!?

I think that changing the motherboard is the easy way. Its like your car doesn't go in reverse and some guy says, "change the transmission" instead of fixing the problem.

Do you know what would cause a motherboard to go wrong? Does just taking the screws out do this? I wouldnt think that. I made sure that the screw wasnt holding a charge an all.

Here's one thing, I didnt replace each and every single screw though, but it is held together. Could that be causing the issue?

Macinjosh's picture
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Joined: Feb 12 2004
Posts: 216
Yeah, he's serious.

I wouldn't give up on it that easily, but then again there are two laptops under my desk right now that do exactly the same thing.

However, from what you described, it's possible the machine is in fact powering up, and you just can't see that it's doing it. The ribbon cable connecting the LCD in a laptop is very, and I mean VERY sensitive. Getting bent over, folded, plugged in improperly, etc could have killed it. Or it could be not fully seated/connected.

Here's what you do. Take all PC Cards, hard drive, CD/DVD, battery, and RAM minus one stick, out. Plug a monitor into the VGA out, and see if it appears on the monitor. There may be some button sequence you have to push to get it to use the monitor instead of its LCD.

This gives you loads of possible things that could be a fix; and leaves the LCD and its circuitry and cables out of the equation. Hopefully you see it power up, and you can go from there.

If that doesnt work, you could disconnect the motherboard's battery and wait awhile to let it reset BIOS-related stuff.

All the screws should go back in. Laptops flex, and that flexing without proper support could crack things.

Did you wear an anti-static wrist strap? Did you drop anything? Did you take it down to the bottom plastic or just pull what was required to do the job?

-- Macinjosh

P.S. While you're technically right that replacing a motherboard is replacing all that stuff to fix what is probably one tiny component on it that's failed... replacing the board is cheaper and more comprehensive than replacing that tiny component. Exhaust all possible avenues prior to replacing it though, there's a good chance something just needs connected better/properly.

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Joined: Aug 29 2007
Posts: 4
thanks

Ok thanks y'all. I will give it a shot and let u know how it goes.
Ill try to replace all the screws and I think the keyboard is the one with the ribbon, the laptops LCD is connected via 2 little cables that actually click in. Those are in. What I havent tried is resetting the RAM. thats the first thing I will do. Wish me luck! This laptop cost me about $2600! (2.5 years ago).

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Joined: Aug 29 2007
Posts: 4
correction

correction my weezy says they were closer to $1700.. its still alot!