?? - Monitor Stays Dark Until Second Reboot

I just upgraded the memory in my PM7500 to 48 Mb. Now, after it has been off for several hours, the monitor (14" Apple Plus) stays dark when I start up. If I reboot, the monitor is fine. System 7.5.5, no ram doubler. Any advice on this problem and on the best memory slots for three 16
Mb DIMM's in a 7500 (I have no manual)? I have tried slots A1, A2 and B1 and A1, A2 and A3.
Carey Beall
beallc@jsc.mil
zincbAsked:
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tekmoCommented:
You're putting the RAM in backwards.

Put the chips in slots A4 B4 and A3.

I haven't seen this particular monitor symptom before in relation to RAM, but I've seen the damndest things, so I wouldn't be too surprised if this corrects the monitor problem. Write me back if it doesn't, I've got some suggestions on the monitor thing. None of which you probably want to hear at the moment.
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150872Commented:
If the screen lights up after second reboot, you're maybe experiencing problems with your battery. Try to Zap the PRam with the little red button on your motherboard (carefully, nobody here wants you to kill your computer, you know, the old static thing...). If you've access to another computer using the same type of battery, try to boot with another one.
This is a well know problem on older machines like LC 475, after 2 or 3 years of use...
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zincbAuthor Commented:
I moved the memory around from place to place, with no apparent difference in operation, but finally left them in the recommended slots.  I also found out from Kingston that these  DIMM's are meant for a HP machine, even though they do (eventually) work on the PM7500.  

I wil try the PRAM-zap via the mother board, next.  The keyboard Control-Option-P-R PRAM reset doesn't do anything.

My last experiment is to keep the monitor plugged into a live outlet, instead of the daisy-chain plug on the back of the 7500.  It seems like something gets charged up during the initial boot. After I pry the mouse from my 5-year-old daughter's hand I'll give it a try & report back if it makes a difference.
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