My game squeals like a pig ! ! ! ! !

INOVERMYHEAD

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Sometimes when i start up my off road challenge, it makes a horrible squealing noise, It only makes the noise why it is doing the rom check, once the check is done then it stopes making the noise and everything works fine. And sometimes it doesnt make the squealing noise at all. Even when it makes the squealing noise all roms show ok. what is making it sometimes squeal ? ? ? ? ?
 
It's the fan belts on the cars...


Is the squeal coming from the speakers? monitor? power supply?
 
Sometimes when i start up my off road challenge, it makes a horrible squealing noise, It only makes the noise why it is doing the rom check, once the check is done then it stopes making the noise and everything works fine. And sometimes it doesnt make the squealing noise at all. Even when it makes the squealing noise all roms show ok. what is making it sometimes squeal ? ? ? ? ?


Could be this:

http://www.arcaderestoration.com/index.asp?OPT=3&DATA=57&CBT=24
 
Check the voltages. I know that sometimes Galaga's will squeal during boot-up ROM/RAM check, but then be fine during the game. Adjusting the voltage up to prevent resetting also makes this squeal softer and sometimes goes away completely...
 
I got it dialed in at +5 volts perfect, like i said, its a coin toss, sometimes it squeals, sometimes it doesnt, ill try running the power up to +5.05 and see what happens. . .
 
I was going to go up in incroments of .05 just to be safe. . . board's worth to much to take any chances with. . .
 
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