won't 与wouldn't 都可表“意愿”，这没问题

它们既可用于表人的意愿，也可以表某些物的意愿

She wouldn't tell me she was poor.

My car won't start. 现在的情况

My car wouldn't start. 那时的情况

你题目的句子，前后文都是过去时，中间夹个"现在时"，怎么搞？

my computer wouldn't  start  （√）

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### wouldn't start 比didn't start 语意要强烈一点

### 把句首的 I thought 删掉，自己不至于这么傻的。