Replacement screen Put in a new replacement screen and the computer still want turn, so what have I done wrong?

Aparently, a "full diagnostic" has NOT been done. If this statement were true, you would have found the cause of your problem.

With that said, backfiring is usually caused by damaged/leaking exhaust valves. Have you performed a compression test on this engine?

If the computer is "getting the wrong reading of the air/fuel mixture", then you should be getting oxygen sensor and/or fuel trim codes.

The coolant temp sensor does not cause the computer to get the wrong reading of the air/fuel mixture, it causes the computer to get the wrong reading of the engine coolant temperature. Although this will affect how much fuel the computer gives the engine, it does not cause it to get wrong readings of the mixture.

Just so you know, "diagnostics" consist of a WHOLE LOT more than hooking up a code reader and pulling codes from the engine computer.
People think that an automotive repair technician simply plugs in the "magic box" and replaces all the parts the "computer" tells him to replace...I WISH it were that simple!

Did you change the data cable for the LCD? Probably a poor connection. What was the reason for changing the screen? Broken or was there issues before with viewing the images?

There are so many things you could have done wrong, it would take too long to write. Loose connections, hooked something up incorrectly, connections switched, did not ground yourself, static electricity, put screws in the wrong place and one of them shorted out the motherboard, .......not much of a solution, but there are way too many possibilities.

hi, this is a very common problem the problem you are having is with the contact between the screen and the circuit board it usually goes like this after it has been dropped or got wet or damp, now the bad news is that the screen will need either replacing or taking out and putting back in correctly.

you could try hitting the mp3 into the palm of you hand to try and shock it back into place how ever if this dont work then the chances are the screen needs replacing due to damaged contact.

now if you have done this type of work before then you can try and repair it yourself if you can get hold of a new screen ( you could try the well known auction site for this part) but if you have never done this before then please leave it to someone who knows as its not the easiest of parts to replace and you could damage the circuit board further by getting it wrong.

the thing you have to work out is if the cost of repair is going to cost more than a new one then is it worth fixing or not, the chances are you could get a decent second hand one for the same price as paying to have this repaired

If you have already tested and changed the RAM then from your description and the things you have done, it looks like you have a faulty motherboard.
This computer is too old to consider replacing the motherboard, if you could get one. If it was me I would put my money towards a new one.
You could use the hard drive, put it into and USB hard drive adapter case and use it as an external USB hard drive.

Is you new hard drive lager than you old on and was the disk drive a factory replacement cause with those disks if you even change just that they will not work

try leaving it unplugged for a few minutes. if that doesn't work, then turn it back off, remove the ram completely, reboot without it in there, then turn it back off, then reinstall the original ram, then turn on again. (might sound ridiculous, but the computer is just not recognizing the ram) you'll want to be sure that it is completely pushed in also. otherwise it will fail

I have a friend who had the same problem, if its brand new you will be able to take it back for a replacement, its nothing you have done wrong so dont feel down, trust me take it back, explain the the clerk what has happened and they will replace it with a new one

put os in cd drive and boot up to install new copy .if system says ** os found you k**w you have hd problem you can try to fix or reinstall new copy anyway.remove hd and re seat it first.check mem .remove ,check connections and replace.go into bios and select default.save and exit.
see how you get on .
sounds like missing or conflicting software but try all the above first.If it is missing or conflicting software pretty easy to fix.let me k**w

hmmm..interesting....you may need to download the system drivers, usually for bios or other utility programs. the compatibility issue with batteries, is based on the make/model being loaded into the listings from the sysadmin for your operating system.

www.hp.com