This is my first question. I have 11 Hp/Compaq D530 CMT computers that won't post. They have a 2.8GHz Intel Pentium 4 processor with a 533MHz Front Side Bus, a 40GB hard drive with 512M of memory. When I turn them on, the fans come on, the on/off LED turns on and that's it. This is what I have done to troubleshoot them thus far.
Replaced the power supply with a known good one from the same model computer that works.
Disconnected the hard drive, Floppy, and CD ROM.
Swapped CPUs from a known good computer.
Put the CPU from a dead computer into one that works and the CPU works.
Measured the +5, +12, +3.3 and the CMOS battery with a Fluke bench meter. Can't find a place to measure the CPU core voltage though.
Replace the CMOS battery with a new one just to sure, although even if the battery was dead, it would still post as far as I know.
I have used an Oscilloscope to make sure the voltages are clean.
Installed memory from a known working computer.
Installed both AGP and PCI video cards to see if there is something wrong with the on board video.
Rest the BIOS. These computers have a push button instead of a jumper.
Inspected the capacitors and they look fine. No bulging or leaking. They could still be bad, but I have always seen leaking and bulging.
Here is the kicker. When I remove the memory, the computer beeps 5 times, pauses and beeps 5 times again and again just like it should.
The BIOS IC is not one that I can remove and replace. All of the ICs are SMT and soldered. I don't have the proper tools to work with SMT ICs and don't know which IC is the BIOS anyway.
I think that's it as far as I can remember. I've burned myself out on these computers, but at some point I'm going to remove the motherboard and set it up outside the case and try and find a place to scope out the CPU core voltage. I may get a capacitor kit and replace the capacitors, but would rather take a look at the CPU core voltage first. If I have missed anything or if there is something else I can do, I would appreciate any help with this.
Edited by Kenmc, 27 January 2012 - 03:44 PM.