Amiga 500 plus with boot problem

[Oldsmobile_Mike]

It's unclear from your post, but I'd start with the following:

What model is it?

If you turn on the power with no disk inserted, do you get the "insert disk" screen?

Does the caps lock light blink?

Are you able to boot off a Workbench disk?

Have you tried with any/all expansions removed?

Possible the CPU may have failed and/or be in the process of failing, if you get an intermittent white screen on power-up.  More likely a connection issue, but do you have a spare you could swap in as a test?

[Oldsmobile_Mike]

500 plus should be rev. 6A. Look over all to see obvious first. Check for mis-cut trace for 2 Meg Chip RAM Mod. Remove 501 Memory Module if you have it.
Cheers!!

Above information is incorrect.  500 Plus is Rev. 8A motherboard.  Has 1MB chip built into the motherboard, optional 1MB chip in the trapdoor slot.  No chip ram mod necessary, and doesn't use a 501 (a 501 is for the regular 500 - only adds 512K - 500 Plus generally uses a different board to reach it's full 2MB of chip).

I would think Denise, too, but it's on the far side of the motherboard - not likely to be affected by battery damage.  Still, worth a good cleaning of it's socket.  

Hope for OP's sake it's not bad ram on the motherboard...

https://en.wikipedia.org/wiki/Amiga_500_Plus

[Oldsmobile_Mike]

Pop it open and confirm what ROM chip you have.  Stock 500 Plus should  have 2.04.  Assuming you've removed all expansions, when you flip the  power switch you should see a 2.04 early startup screen, the floppy  drive should click, and you should be able to toggle the caps lock.

[Oldsmobile_Mike]

A500 Plus was bought from Air Force Base Exchange. "Refurb" yeah! They installed Rev. 6A MB. Guess I was had way back then. $499.00 OUCH!!  :lol:

Yikes!  I remember going to the PX with my dad way back in the day.  First time I ever saw an Amiga, it was love at first sight.  Those were the days!  

[Oldsmobile_Mike]

If you're not getting an "Insert disk" screen, you definitely have either a ROM problem, or a video problem.  :rofl:  (haha, since you know this already)

I'd revisit that ROM issue, though.  When you turn on the power with no disk inserted you should see an "insert disk" screen.  Clean and reseat the ROM, or swap it with another one if you have a spare?

[Oldsmobile_Mike]

Wouldn't a faulty rom cause a red screen error code? Or maybe not?

Like someone mentioned earlier, could be faulty ram. I think a memory tester from aminet might be an idea? You never know your (dis)luck. lol

Yes, that was me that mentioned the possibility of faulty ram.  

I've never heard of a case where you could turn on a system and boot off a game disk and play the game with just a little bit of graphics corruption (and presumably sound), yet when you turn the machine on without a disk in the drive it just gives a white screen, no "Insert disk" screen.  .......LOL, maybe he's got a malfunctioning floppy drive that's throwing some crazy error?  Could be anything at this point.  :lol:

What kind of monitor is this hooked up to?  Can you confirm the monitor displays correctly with any other system?  PAL and NTSC modes both display correctly?  (if I remember most A500 Plus's were PAL, is it possible your monitor is NTSC only, that's why you're not seeing the "Insert disk" screen?)

[Oldsmobile_Mike]

I found different roms but what is the best for my amiga 500 plus between 3.1, 2.04 or cloanto 3.1?

Just get a regular 3.1 from somewhere like AmigaKit.  They typically run under $20 USD.  Read the forums about people having various problems with the Cloanto "3.X" ROM, I'd avoid those things like the plague.  :p