Hi Col Price, it's as I outlined at the start of the thread - as you know Trainz is very RAM hungry and although I have 4 GB installed my PC can only "see" 3 GB. Therefore I have paid for 1 GB which my PC isn't using.My PC should have 25% more RAM than it does.This doesn't make sense and I have followed every logical step to address the problem but been defeated. The next step should be to take my PC down to the river and throw it in but I don't have sufficient dosh to buy a new one.
Just had a thought it may not be a bios problem, it may be mixing the type of ram? According to my search on Google your PC is supposed to take 4GB of dual channel DDR400 in which case it doesn't look like a bios problem.
Couple of questions.
When you boot up how much ram is it showing?
When you installed the ram did you access the bios, some boards won't recognise extra ram until you access the bios and save.
Are all, I presume four, sticks working individually, try them one at a time
If you have a manual, check you don't have to add a jumper or something when you add extra ram unlikely but it is a Packard Bell and they are a bit weird.
Suggest running your system through Crucials memory scan and see what they think you have installed.
Regarding bios upgrade if it really does need one have a look at wimsbios.com, if you can't find an upgrade through that site it probably doesn't exist.
Also they have instructions on how to recover a failed bios flash with a dead PC, can be done if you have a floppy drive and a copy of the original bios.