A1200 Problem

[nasty]

My Amiga has developed a small problem with booting!

Right where to start,  I switch the Amiga on (sig) and the HDD light comes on and stays on and i just get a black screen or the insert floppy screen. so I stripped the amiga bit by bit first removing the bppc and working back to a bare system. So even with nothing connected the HDD light stays on and i get the insert floppy screen, I've changed:

2 x Motherboard
1 x 3.5 HDD
2 x PSU
3 x Buffer interace
2 x IDE cable
1X 3.1 ROMS

Also tryed a 2.5 Hdd but the light still stays on and refuses to boot. what you guys think? Sometimes the system runs perfect and most of the time i just get this carry on so any thoughts would be great :-D

EDIT:
POST UPDATED!

[nasty]

Nasty, when you say you have stripped it right back, did you remove all IDE devices too? So it's just a bare motherboard?

Yip all thats left connected was the power tower light connection. So i'm kind of thinking that it is the psu at fault!

my psu specs:
rated 250 watt
peak 300 watt

+12v 15a
+5v 25a
+3.3v 18a
-12v 0.8a
+5v/sb 2.0a

I'm thinking its a psu issue, as i noticed that the fan in the psu does'nt rotate. So I replaced the fan (works) and still nothing on the amiga side. The amiga will sometimes boot with the BPPC removed and im back to noticing that the green light on the powertower is alot brighter without the card inserted hence reason 2 for thinking of some psu related problem. Over the last few days the machine has booted with everything in it and it runs find for hours then when i turn it off then try and get the thing to boot again I get all this hassle:-?


   

[nasty]

updated my post above  :-)

havent tryed cutting pin 1 but its something else to give a shot if its doesnt seem psu related  :-D

(it's funny cause if this was my PC giving me this hassle it would be made into a micro cube with a big big hammer 8-) )

[nasty]

Are you able to verify the psu output voltages with a meter

Not at this time as it took me 2 hrs to buy some screws from maplin yesterday, all these bloody holiday shoppers :-o

Oh you have already tried 2 psu

I dont think the other psu's where upto the job. I'll run out into the back garden and see if i can find where i throw the bigger one (it was higher watts but i think lower amps)

[nasty]

Second PSU specs:
Q-tec psu 400wp,dual fan gold (st-400ATXP4).
rated 400 watt

+12v 16a
+5v 30a
+3.3v 20a
-12v 1.0a
-5v 1.0a

So im guessing this should of been plenty to run the system?

[nasty]

Ok after messing about all day i managed to get the system to boot up and run pretty good. But now i have a new problem the amiga refuses to boot from floppy disks in df0 or df1. all i get is the amigados window :madashell:  so does anyone have an idea what could be causing this?

[nasty]

You certainly live in interesting times

indeed i do :-P, but you gotta love your amiga :-D  

Ok after messing about all day i managed to get the system to boot up and run pretty good. But now i have a new problem the amiga refuses to boot from floppy disks in df0 or df1. all i get is the amigados window  so does anyone have an idea what could be causing this?

i forgot to add that df1 will read the floppy from workbench [hdd] but not booting