|If the display shows "Entering Power Save Mode" - at least the monitor is working.|
You need to somehow re-enable/renew the internal speaker; the (audible) POST signal would be very useful to have - as a possible indicator as to what's amiss...
If the HDA cable isn't long enough can you not secure an extension for it? ( I have to admit I had no idea what an HDA cable is - until a wee trawl via Google...; must be getting olde...)
An alternative and temporary measure - If you can get hold of a very small speaker, and solder, or with croc-clips, attach two wires to it and then "croc-clip" the other ends to the speaker terminals on your broken internal speaker, that may at least allow the POST signals top be heard? Even a small ear-piece as used in transistor radios (remember those); or any standard/current mini-headset (ipod/ipad etc.) ear-piece will do likewise; simply clip a wire to the tip and one to the larger (barrel) ring on the mini-stereo plug; and the other ends as above to the internal speaker connections...
Standard (the larger size) earphones will do equally well...; and may be easier to clip to?
Somehow you need to hear those POST signals...?
Do any indicator lights "light up"; as in power indicators, hard drive activity - even in only briefly?
Have you checked the volts out of the power supply (they are know to to fail on occasion - and even more so if working hard/close to the their stated limits/specs.)?
Also - very basic I know- but have you verified that the mains-cable into the case is actually OK - that it delivering standard 120(?) volts into the case?
Also is there an on-board fuse (mains rated) anywhere' - typically it may be within the psu housing? Similarly any on the motherboard...? When last I bothered to build a PC there were such useful items easily viewable and verifiable...
Meanwhile - and a tres long shot and almost not worth considering - but - what happens if you remove the plug-in graphics/video card and try a boot up?
Until you get the POST signal info. you are really feeling in the dark for a black hole...? Although a volts check on the psu etc. may provide some info?
Based on info thus far - it has a feel of a psu problem...; if the graphic/video adapter is OK?
btw - what is a GPU - as in My GPU isn't plugged in.?
message edited by trvlr