I have been having on my PC the problem mentioned in this post title, since last week now...
Since I can't even check into BIOS, I have looked up written notes I had from when having problems with my PC earlier this year, and my BIOS is a Phoenix BIOS (v. 5.11, 28/8/2009).
With this information I checked that my PC should make a beep when starting up fine, and well, it doesn't anymore...
So basically, from what I read on the internet, my PC is not "POST"-ing.
So I am more and more inclined to think that this may be an hardware issue, either motherboard (mo-bo), or graphics card, which unfortunately, is integrated on this mo-bo.
The thing is I had been having heat issues with my PC since summer 2015... But I was not confortable /familiar at all with opening an all-in-one PC, esp. since I checked HP servicing guide for my model, and it does NOT recommend opening up the case ! Now I can tell this was complete non-sense (probably geared to people blowing up their PC after a few years and having to buy a new one !!!).
So this week, when finally confronted to a big problem, a Black Screen on start-up, I had no other choice than to finally try and open up my all-in-one PC (thanks to a youtube video tutorial from W. Quinn), and found out that the grid above the fan and leading to the heatsink and exterior of the PC was indeed clogged with dust (just like on the video of W. Quinn, who is also opening up a broken PC...).
Just to make sure my Original Post (OP) is well understood, I want to stress out that:
- ALL "BSOD" abbreviations used in my OP are for BLACK Screen of Death;
- the only abbreviations used for BLUE Screen of Death are "BlueSOD".
The following is a detailed description of the events directly leading to my PC not starting anymore. I am no computer expert, but I am hoping it could guide experts of this forum to better pinpoint the issue...
BlackScreenOfDeath (BSOD from here on) started last week, on TUE. as follows:
I get a BlueSOD crash dump, and then before it gets to the 100% mark for the dump, I get what seemed my 1st ever "crash during the crash dump"... the screen turns black straight after that, and the PC does not shut down/ restart as usual. When I press the start button to restart, I get my also 1st ever BSOD: no BIOS flash screen, no Windows logo...
Then after abt 1h30, PC starts again (1st restart after initial BSOD), without me having done much, except trying to start it every now and then w/ start button.
After abt 30mn of PC on, while trying to back up data w/ Windows7 back up tool, crash dump again and then BSOD.
Just after that, I read on my smartphone abt the trick of unplugging PC power plug, while pressing power button and it works, PC starts once again (2nd time).
BSOD on restart:
I choose SafeMode, and try again to make a back up w/ Windows7 back up tool, and realise it s not avalaible in SafeMode so I restart computer... But goes straight into BSOD once again...
Again, abt 1h later, without me having done much, except reading abt BSOD on my smartphone and trying to start the PC every now and then w/ start button, PC starts again (3rd).
30mn later, while trying to make a back up of data in normal mode w/ Windows7 back up tool, BlueSOD once again...
I decide CHKDSK is needed before anything else, in case I manage to start PC again...
Which I do, abt 30mn later. Not sure if dumb luck or if the trick of unplugging PC and pressing power button worked again... Run 1st SFC /SCANNOW for abt 30min (everything normal, just 1 "repairing" on CBS.log). I leave computer on for abt 5h while I work next to it. I switch it off to run CHKDSK on next boot... Fails to switch off, I switch off manually. On 1st try, PC fails to boot, on 2nd it boots fine and CHKDSK launches for abt 2h. I then try to run Windows7 back up tool twice, no BlueSOD this time but get a "0x80070001" error... End of day, tired, I switch off PC to try and solve on next day... PC switches off fine (does not lead to BSOD w/out shutting off completely).
PC starts fine in the morning on 1st boot.
I try again Windows7 back up tool (still w/error mentionned above that I am trying to solve), and abt 1h after start up, it leads to a crash and BSOD.
1st restart does not work (BSOD); 2nd restart works. I finally manage to solve error code for Windows7 back up tool (deleted all 17 of my "mounted folders" according to a MS support page), but then get straight another error code when trying to back up (0x80070539 in EventViewer for VSS)... I need to leave and switch off the PC (switches off fine).
On the evening however, when trying to reboot the PC, nothing... Leads straight to BSOD. I start to think it may have something to do w/ dust since I had heat problems this summer and PC would power off (but would always restart fine). Don't know if had to do w/ moving PC to check screws etc, abt 1h after 1st restart try, boots again. But it's late again, I switch it back off fine to go to bed.
Starts fine when I wake up... Me thinking "phew"... However, when I come back to it abt 45min later, PC gets a BlueSOD crash dump, then fails to properly shut down and leads to BSOD once again...
Since then, seems I have finally run out of luck: zip, 0, nothing, not on a single try have I managed to turn it back on. And when I say nothing I mean NOTHING: not a single blip on the screen, not a single BIOS flash screen (which I had set up to display on each computer boot), and of course... no Windows logo.