If you can try try a restore point prior to when you noticed the problems and see if that helps
My Dimension 2350 has been shutting off before loading the desktop the last day or so. I will get the Dell logo/BIOS to load, but at some point after it gets to the user log in menu, or the "do you want Windows to load normally, an improper shutdown last time etc." screen, it will just shut down--the computer turns itself off.
Someone suggested that I check out the fan--I think that may be the culprit, because after turning on the computer, I could hear no fan. I didn't disconnect it from the mobo but I did manage to detach it from the case, and then I vacuumed it out. Now I can hear the fan (and it does push air out the back), and the computer will now go past the login screen, allowing me to log in and start to load windows, but a few seconds after the desktop appears, it shuts down still.
I would like to keep repairs under $50 if I can, or else it would start making sense to simply buy another desktop, as this one is 5 years old. I've heard that if the fan is gone, the power supply also will go soon. Is that correct? Any troubleshooting recommendations?