HP EliteDesk 705 Mini no boot

[Theguywhobea]

Hi All, just wondering if anyone has any specific experience with these machines. I ordered one from eBay since you can get them very cheaply and wanted something to play around with. It was sold as used and in working condition, however it appears it was DOA. I tried multiple different power supplies (since these use a laptop style PSU). Tried different amounts of RAM in different locations, still nothing, stone dead. Contacted the seller about this and they claim that it's actually because I am using a generic power supply and some Dell power supplies and that these PC's only work on HP branded power supplies. That doesn't sound right to me? I even was able to back probe the power input and I could see 19.5v DC coming into the board which again pointed me to the PSU not being the issue...

 

Any hope here or is it likely that I'm just out $35?

[tkitch]

These boxes are kinda picky about the power supplies they use, so it's not impossible that the seller is correct.

 

See if a local repair shop has one you could test with in person before buying?

[Selle]

If you try to power on one of these with a power supply that is not powerful enough the power LED will blink red and the internal speaker will beep a post code. I have never tried a non HP PSU on them, but if that was the issue I would think it would give the same post code as when you try a PSU not powerful enough 

[Theguywhobea]

4 minutes ago, Selle said:

If you try to power on one of these with a power supply that is not powerful enough the power LED will blink red and the internal speaker will beep a post code. I have never tried a non HP PSU on them, but if that was the issue I would think it would give the same post code as when you try a PSU not powerful enough 

Yeah that's what the seller said as well, however that was not what I observed. This one was stone dead, no lights, no beeps, no sign of life with either a 65w power supply or a 330w power supply. I can't imagine that a 330w psu would not be enough...

[Kilrah]

It's usually not a question of being enough or not, it's a question of the machine communicating with the supply, checking that it's the correct genuine HP model, and refusing to work if it's not.