Hello, today I decided to help someone very close to me and promised to help. They have old Pentium 4, DELL 510 Desktop and all of a sudden it stop working. When Power button pressed CPU fan starts to spin in and out. Like when you start computer CPU fan usually goes to 100% very quickly and then go to it's nominal speed as dictated by current thermo reading controlled by bios. In this case fan goes fast ..then slow ..fast ...then slow (I don't think fan reach 100% when it's "fast" cause it's not loud at all) in and out for about 30 seconds, then system shuts off. Right away I thought about PSU and replaced it with working unit, didn't help, same story. I reseated RAM modules nothing helped. Because system is kinda old and I really want to help I am stuck and don't know what to do. Any ideas on what can be wrong ?
In my experience if CPU faulty PC wouldn't start at all, no fans no nothing. I checked, all usb connections and network card for any shorts , no visible crosswire. I simply don't know what else to check.They saying it just died in the middle of work session. Anything beyond PSU I puzzled. I could not find CMOS reset switch on MB but I don't think it'll do anything.
If any ideas, anything at all I'll be very grateful cause I am stuck with this one.
In my experience if CPU faulty PC wouldn't start at all, no fans no nothing. I checked, all usb connections and network card for any shorts , no visible crosswire. I simply don't know what else to check.They saying it just died in the middle of work session. Anything beyond PSU I puzzled. I could not find CMOS reset switch on MB but I don't think it'll do anything.
If any ideas, anything at all I'll be very grateful cause I am stuck with this one.