0

I am trying to fix a Dell desktop Inspiron 3647 that is not turning on at all. I've searched a lot about this, but I only find the same suggestions that don't help me with my problem.

When I press the power button nothing happens. No fan, no beep, not even the LED lights.

  1. The first test I ran was the power button. But it passed the Continuity Test. I even replaced with another power button.
  2. Then I ran the PSU BIST which led me to the conclusion that HD, Motherboard (at least in this test), CD Drive, and the PSU itself seems to be working fine.
  3. Then I changed the CMOS battery for a new one, but yet nothing happens.
  4. I removed the RAM and the CD Drive, and still, the computer doesn't turn on.
  5. I also tested with a known-good PSU as suggested by @Ƭᴇcʜιᴇ007

What else could I do to find what is preventing the computer to turn on?

EDIT:

I believe the problem is the motherboard or CPU, since I removed/replaced almost everything (including PSU and power button) and still, the computer gives no sign of life. However, as I said, the motherboard also passed the PSU BIST test. So, should not this indicate that the motherboard is working well?

Wesley Gonçalves
  • 111
  • 1
  • 5
  • In general, if you remove all the RAM, then the motherboard should beep like there's no RAM. If it's not, then the motherboard is probably faulty. Try a different, known-good PSU, and if that doesn't help, try a new motherboard. – Ƭᴇcʜιᴇ007 May 17 '19 at 19:14
  • 1
    Possible duplicate of [Any way to tell apart a CPU defect from a mainboard defect?](https://superuser.com/questions/228946/any-way-to-tell-apart-a-cpu-defect-from-a-mainboard-defect) – harrymc May 17 '19 at 19:47
  • Thanks for your help. But the motherboard is passing the PSU BIST test. Shouldn't this indicate that the motherboard is working? – Wesley Gonçalves May 17 '19 at 19:48
  • My understanding is that the PSU BIST only really tests the PSU. I don't think passing that test rules out a motherboard issue. – fixer1234 May 18 '19 at 02:48

0 Answers0