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Mac IIsi boot to gray screen without mouse pointer.

Hi guys.​
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I have a Mac IIsi board that is not working.​
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It boots to the grey screen without the mouse pointer or making the boot chime. It does some rattle noise on the speaker though.​
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It was this way even before removing all the capacitors, washing the board (let it dry for some days) and recapping it.​
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Its PSU, memory and HD boots fine the other Mac IIsi I have here.​
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Any hints?​
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Thanks!​
 
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