HP Pavilion a1440n Devices systematically failing more each day...

[SPDworks]

First, the DVD/CD-Rom Drive started posting [Code 41] about six months ago. 

Then the DSL connection to the NetGear N router, via a Linksys G wireless adapter was losing connection about every 15 or so minutes, though connection usually could be reestablished through the "repair" option from the systray. It could not, however, be connected, using the "connect" option from "Connections," and retyping in the SSID and key encryption, as it once could. This began about a week ago.

Most recently,  the LGE L1722P [Monitor] (17.1"vis, January 2005) monitor stopped going to "standby," and instead went into a "hibernate" mode, from which it wouldn't return to viewable at all, unless the entire system was hard booted. This began about a week ago as well.

Could this be a sign of an aging motherboard, cpu or both? I have recently (about a week or so ago now,) downloaded and installed a new utility from SlimWare Utiliies, where the system is scanned, and I have the option to remove any or all available programs it finds existing on my machine. I think the only ones I actually took off using that program (SlimCleaner), were the ones having to do with iPods, iPhones and iPads, and synching my system to work with those devices, since I don't have any of them. I did, however, opt to keep the Safari browser.

I should probably mention that the environment for my system is very dry, although, the area is quite warm periodically (up to 80 degrees F at times,) as the circulation in the room is not always as good as it should be.

So could this also then, perhaps be an issue with the fan(s)? The room is fairly dusty all the time, as the EMFs are quite high with all the electronics nearby, and the room is not nearly as big as I'd wish it were to house all the things in it for now. However, it's the best to be done for now. 

Originally my system specs were as follows: specs for HP a1440n, when purchased from Circuit City in late spring of 2006. 

Since then, a few things have changed with the system as follows:

It still runs with a processor 2.80 gigahertz Intel Pentium D and on the WinXP MCE 05 SP3 (build 2600), with these changes in hardware:

NVIDIA GeForce 9400 GT [Display adapter]

and the drives now are like this:

ROHU J4PQJKL SCSI CdRom Device [CD-ROM drive]
Generic USB CF Reader USB Device [Hard drive] -- drive 3

Generic USB MS Reader USB Device [Hard drive] -- drive 5

Generic USB SD Reader USB Device [Hard drive] -- drive 2

Generic USB SM Reader USB Device [Hard drive] -- drive 4

HP Photosmart C3180 USB Device [Hard drive] -- drive 1

ST3500630AS [Hard drive] (500.11 GB) -- drive 0

(this is the Seagate 500 GB internal HDD I had to replace the original one)

500.09 Gigabytes Usable Hard Drive Capacity

325.69 Gigabytes Hard Drive Free Space

I have also swapped one bad memory card, so the layout for RAM now looks this way:

3072 Megabytes Installed Memory
Slot 'A0' has 1024 MBSlot 'A1' has 1024 MBSlot 'A2' has 1024 MBSlot 'A3' is Empty

Most recently, I've had to change out a failed PSU, and this is also when I switched out the old RAM for the new.

The system is now 5 years old, at least, but was running great after the PSU switch in November/December last year. Until this past month. So any help with understanding what's bad, what's good and what's ugly and needs to be put down, please, please let me know?

In the meantime, I'll be dusting out the case and hoping maybe that'll be enough. Thanks for reading and for any help you can offer.