Bulged tops....REPLACE IT.
Any near a heat sink that could get hot....replace it
KEY IN on only the caps that are rated at being used on a 5 Volt line ! 25 Volts or less if that's what your bulged cap is.
This is what I'm thinking.....
I think the 5 volt supply could be messing with the digital data bus that communicates with the H and the DG board !
The only two supplies that I'm PRESENTLY aware of would be the 5 V and 15 V supplies so we should seriously concentrate on making sure the power supply voltages are RELIABLE.
After all.....my first mentor told me to ALWAYS check the power supply voltages FIRST.
Then you start isolating any issues left over.
I doubt your DG board is bad...I think the voltages to it are low.
5 Volts is bad if it's out of 10% of desired voltage, so at 4.5 volts....it's bad.
Even 4.6 isn't good to me. 4.8 to 5.1 is ok in my book.
Now the reason I emphasize the 15 Volts too....it runs some very low voltages used to power up the ICs on the DG board.
If you have a soldering iron, it's just as easy to replace the bulged caps.
If the caps in the Red box are the ones you find BULGED --
Then those are the ones I would expect could cause your problem.
Any others are too large and too high voltage to affect your DG board.
I will let you know that P25 plug on the power supply seems to run over to the D board. There the voltages get delivered to the DG board. Regulation /stepping down the 15 Volt line to micro voltages are done on the D board, but those are 3.3, 1.8 and 1.2 Voltages. The D board I don't believe is involved. The SD card works fine.
Replace those caps, and if you need more info to help, let me know.
I'm pressing the ANSWER BUTTON, but that doesn't mean it's the ANSWER.
It just locks out the information to the search engines out there.
There is another button besides the ACCEPT button....use that, not the ACCEPT....at least not until we are done, ok?