Confusing behaviour with my emachines W2646

As a Christmas gift last year I was given a used W2646, almost immediately after we had to repair the OS (it was missing vital files), purge a virus filled system restore, run scandisk, defragment, and contend with windows auto update messing up. (trying to install the same file over and over again) A little while ago it started to shut itself down while I was right in the middle of something (in fact it corrupted a game file that was saving at the time of one of those incidents, making me lose over an hour of hard work in there) at first I thought it was a virus or something, but after trying many different scanners, I realized it was pretty clean, also checked for other forms of malware... too many different things to remember the names of em. (an annoyance of it self-shutting down is that it resets the taskbar every time it does that, dont know if that is important) So then I figured it was the power source, because it most always is when it comes to comp problems in this house. (and it was a used computer too) After changing the power source those problems ceased (except for two occasions) but then I noticed (as I did when I was about to change the other PSU (that is the right term, right?)) that it wasn't receiving the command to shut itself down after the rest of the comp turned off (before the automatic shutdowns I had no problems of this kind, and matched the attachments perfectly when switching the power source out) the activity light was rapidly flashing constantly, and the power source's fan was still active (I have to flip the I/O switch on it to turn it off, the other one did not have this switch)
A more recent thing that has happened, that confuses me beyond definition, is my floppy drive kept trying to scan air, while I was doing other things. Even more confusing is it kept draining major amounts of my CPU and RAM just to do so, (no, no floppy disks were in the drive at the time) so I had to unplug it.

If you can help me out, by telling me what is causing these problems, that would be a REAL big help (although I will still just get a new computer, (custom built, by me, done the research) this is just driving me nuts, so I need to know the cause.

(if my guess is right, it is something with the motherboard, just need a more reliable opinion than my own, my guesses are usually wrong (I thought the Wii would be a big flop, and spell doom for Nintendo for instance)
 
You will need to replace the motherboard. If you read the many eMachines posts here, no matter what the failure is BOTH THE POWER SUPPLY (or power source as you call it) AND THE MOTHERBOARD NEED TO BE REPLACED AT THE SAME TIME!

While you are at it, you can upgrade the processor and memory or you can always buy another computer...

Specifications of the W2646

Operating System: Genuine Microsoft® Windows® XP Home

CPU: Intel® Celeron® 2.60GHz Processor
128KB L2 cache & 400MHz FSB
Monitor Bundle: eMachines® 17" eView™ 17f Monitor
(16" Viewable, 0.27mm dot pitch)
Chipset: Intel® 845GV chipset
Memory: 256MB DDR (PC 2100)
Hard Drive: 40GB HDD
Optical Drive: 48x Max. CD-RW Drive; 3.5" 1.44MB FDD
Video: Intel® Extreme Graphics 3D
64MB Shared memory
Sound: AC '97 Audio
Network: 10/100Mbps built-in Ethernet
Modem: 56K ITU v.92-ready Fax/Modem
Peripherals: Standard Multimedia Keyboard, 2-Button Wheel Mouse, Standard Stereo Speakers
Ports/Other: 6 USB 2.0 ports (2 on front), 1 Serial, 1 Parallel, 2 PS/2, Audio-In & Out
Dimensions: 7.25"W x 14.125"H x 16"D



Good Luck
 
Hmm, figures. Well if that is the case, then I am just going to leave it alone, and let it die. I am not going to spend money to repair this computer, when I am going to be building a completely new one soon, just wouldn't be very smart of me. Thanks for the help, and I don't keep up with some "computer terms" so... power source/supply all the same thing to me. Again, thanks.
 
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