aminga 500 green screen please help

[ste182]

Hiya guys, ive just got another amiga this time an a500. But when i tried to turn it on i just got the power led blinking and a green screen which sometimes turned yellow and red. Ive had alook on google and this error could be to do with chip ram ive checked the motherboard no battery is leaking and everything looks in pristine condition i dont know which chip is the ram chip and how would i be able to fix this? thankyou

[ste182]

nope nothing in the trap doors, theres was a tiny bit of crap near the battery(it didnt look like a leak though) sometimes the screen has gone red and sometimes yellow ive made sure all chips are cnnected properly.

the only thing i have to go on is the little bit of crap near the batery.

[ste182]

no its like this big blue thing that looks like a small AA battery. i have no idea how im gunna fix this

[ste182]

it is an a500+ sorry i didnt think it was important, ive pressed all the chips down but it did nothing, i think im going to take it nback to the shop if they will take it back haha