Hallo from Greece! I have the same problem with a Travelmate 2303lm. At first, before some months i was geting usb overvoltage errors. Later, when i was booting everything was normal, but the touchpad was turned on (not by me) while I was constantly kept it off because i use a mouse. After that period it started hanging on shutdown and i was removing all power to shut it down. Later I noticed that gentle hits to the lcd caused flickering. Lately the lcd brigthness was little dimmed, but that did not prelude me for the follow up. Before 4-5 days I returned from work I opened it and pressed the power button. It started and then it shutdown at the moment that lcd shows the post screen, that was the last time i saw it lighting. I tried pressing the power again but nothing happened. I removed cords and bats and i ended at the well known story: power led on, fan on for 4-5sec, hd on for 2-3 spins, dvd one long flash, caps, numlock led one single flash. I bought it on Sept of 2004 and I was pushing the hell out of it for all those years (Many many many miles on the road to university, and home 24/7 on the net to download everything. Actually, i always used standby for the move and i only restarted for udpate appliance. I cant remember having it shutdown. Well, i cant complain, i smashed it on the work.
Anyway, I think there is still hope. There is a great deal for all the common faults to be the inverter of the lcd. I think of it as the most possible faulty part because of the above mentioned flickering and dimming. Memory is ok, hd, cpu and dvd are ok (tested on other systems). I dont think it is mobo because if graphics failed (acers have intergrated graphics system in chips with several other devices, like io, pci etc) the whole system goes down which means no leds no fans no disks no martini no party. Afterall garphic system uses memory from ram and thats why a friend said that pushing the ram slots solves the problem, because graphics ram goes online again. My point is that if graphics chip goes dead in an acer, then nothing on the laptop can work. Moreover, if a chip goes dead there is no resurection. It is just bye-bye. Several friends are telling that *if* some condition is held *then* the system boots. That means that is a possible contact connection issue. And that is my theory too. A bad contact problem in the inverter of the lcd. This inverter supplies the backligth lamp with high voltage and it normally heats up big time. To do that it uses a coil. Either overworked or bad constucted from factory, the coil may fail and brake. Heat helps a lot to that direction itself. When the laptop boots and finds no lighting circuit to adjust, an error is reported and system stops for self protection reasons. Thats where system hangs. There is no point on turning to outside display, the keyboard has no authority yet. That means you seat and watch nothing because laptop is not willling to move on for it may be its last step. It might as well know that the coil produces several kilovolts and if a sort-circuit arises all the volts will spread to the rest of its body with the speed of ...ligthning.
Nevermind, thats my little conspiracy theory. Im working to figure out the cause. I think what a friend said before about the bios battery is very interesting and i will try. Nevertheless, Im not quiting, dont you either.