|Only testing the hard drive with the drive manufacturer's diagnostics tests the entire drive, if you use the long test.|
HP's diagnostics may only test where data already is.
".....there is a message which appears on startup which advises the battery is not correct and needs replacing, although on the battery indication it says 100% charged. If left on battery it only lasts 10 mins."
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1:
If there is nothing wrong with your AC adapter or it's connection and the jack in the laptop.......
Laptop main batteries usually work as they should for a year or so, then they begin to rapidly deteriorate. From what I've seen, by two years they cannot be charged to anywhere near their full capacity, and it gets worse after that.
They often develop internal shorts when they are older. If the battery gets HOT rather than just warm after you have attempted to charge it for at least a half hour, or after you have been using the laptop for a while with the AC adapter plugged in, it's definitely internally shorted and you must replace it. Internally shorted batteries getting too hot have been known to cause the laptop to catch on fire.
If the battery is internally shorted it can't be charged to the voltage it is supposed to be charged to, which could cause the bios to generate a message saying you don't have the proper battery, and the run time of using the computer on the battery alone will be greatly diminished.
Tips about battery charging problems on Dell laptops - may apply to other makes.
See response 3 in this by iTech:
You DO NOT have to buy a Compaq or HP battery. There are lots of clones on the web that have the same one year warranty that cost a lot less. Search the web with your laptop model or the HP part number of the battery to find compatible replacement batteries. In many cases for HP and Compaq computers you can get a battery that has more cells / a higher capacity and runs the computer twice as long as the original battery on the battery alone - the only difference is it sticks out of the case a bit, and the back of the laptop rests on the battery instead of on the case. If one is available for your model, it's usually listed in the parts for your model here:
Search using the part number for that battery if you like.
It never fails to mystify me that many laptop and netbook users don't bother to replace the battery at reasonable intervals.
If your argument is you rarely use it on the battery alone, then WHY did you buy a laptop?
If you don't need it to be portable, you always get a lot more bang for the same bucks if you buy a desktop computer.