Thank you for your comment Guru, you mentioned heat sink cream, I suspect that should be the problem, the Acxr is brought 2011, after died in 2016, it's left untouched, after then the Sxmsxng netbook becomes my main for all these years, I mentioned (in other thread) its slow the whole system, but I didn't say I don't like it, I love it, the netbook is brought earlier and everything is still all right until now (except the "Ctrl" key problem mentioned in other topic), sometimes or many times I left it operated more than 10 hours no problem, and under environment with no air-condition. Interestingly the desktop I never left it that long, but died quick with less usage.
I watched videos of people replacing the heat sink cream on Xbox or Playstation, so the PC should be similar, and that there is no way I can have it done, never, even professional its not an easy job. Yes exactly, before the desktop auto restart itself (trying to restart but never able to make it success), the case is very hot even for a short operation time, so that should be it.
First time seeing or knowing a power supply tester, no idea how to use it, I don't think it's the problem anyway because I actually do have another experience, similar or same symptom, but thanks again. Before the two PCs, I brought a shop-build one desktop GXR in 2009, no high requirement to me its for simple things like converting CD to MP3, burning CD VCD etc., audio mix up. That one the shop listed it 5 years warranty, while it died less than 5 months, and you call him, the shop is closed and asking for fee... oh before that happen, before shop close, the PC auto shut down and no power again, have it repaired for me, shortly later it happen again, and call him and closed. THEN, I brought a new power unit myself and it looks professional so that should be the ultimate solution, I thought, it's bigger that I have to left the case open and place the power unit besides or outside the main case. But, shortly later, it auto restart just like this time last week, it's on and off feeling like not enough power but no impossibale it's brand new and high-end.
Back to the Acxr, it died after a pop sound and smell while power on in 2016. It left untouched until recently I applied a Unity mobile game design course, and I found out the 32-bit netbook with atom CPU is likely not enough. Sent it to repair shop, spend 400 and it turn out I only used it like 4 times... they steal the front plate of it (covering the front USB and SD card slot) and that offense me the most, of course he wouldn't say steal, but lost it, but how can it be gone in just 2 days. I am very suspect that, the pop sound in 2016 caused only a small chip to die, or it dies so it pop, should be not the power unit problem while the shop say replaced one ordered one for me, power unit, however in any way I see I feel I think they simply make it more worse, worse like the GXR which is a clear lie and the "5 years warranty" is a big hint, only that I were too stupid, maybe still am huh.
Thanks Mark and Rosbert, the problem is bigger I am afraid, but I did not stayed it clearly before, when it auto restart, it's not restart, it's like power lost and back, and lost and back, until it's lost and no power at all, but, it could light up again by chance.
