Thank you for all your answers, this has been really useful!!
The M90 is a wonderful machine, and I have had mine for about 7 years, and it is still as fast in my opinion as any laptop I have ever used!!
And this is for 3D CAD and really processor and graphics intensive work using the Quadro. And now I can't tell you how well it runs. Really amazing computer, best build quality ever and great performance.
I will summarise the problems and their resolutions, so this might be useful to others.
1. The original flashing lights problem (prior to this thread). No display, and backlight comming on only.
- Computer had been overheating, and this caused the Quadro FX2500 graphics card to warp or the BGA (ball grid array) chips to develop dry joints.
I carefully cooked the video graphics card, after removing all components and heatsink/heatpipes in the oven at 200 deg C for 8 mins. Now it works perfectly and yet the computer still has a tendancy to get hot... I now think that they all do this?!
2. The computer worked for 4 weeks but then would not boot with the error "No boot device present"
- This was caused by a faultly MBR
Easiest way to fix this was using hard disk partitioning tools. Luckily I recovered the partition intact.
3. M90 could not see 4GB memory installed.
64 Windows installed. Also, a weakend clip meant that when fitted the second 2GB memory stick was not fully seated correctly!
It now sees 3.25GB ram!
Originally Posted by matchbox2022
Or solder a new northbridge on. :P
No, only joking.
But I did the following. (a) removed all lint from blowers and heat pipes. (b) re-seated chips and added new heatsink compound (seems to go off after 7 years of overheating and was brittle, grey and probably no good. (c) Checked fans with multimeter to see if they were working, removed and cleaned out gunk with cotton buds.
Now when I was testing the computer, it was still overheating. Literally the heat pipes were way too hot to the touch, and not only this, but the fans did not come on regularlly or soon enough in my opinion.
A check on the temps using Piriform Speccy revealled
Mad tempretures above!!! Especially graphics at 75 degrees C !!!
... and this was at reast, not under load!!
So further investigation, and it seems that the main fan works, but I was puzzled at no Graphics card fan running. So I checked with Multimeter, and also swapped them round.
The physical fan was not broken. Its just the BIOS was not telling it to come on. Weird.
I have to go out, but I will continue when I have returned. Have a meeting at 11am!