Suppose I'm telling my friend about what's happened to me lately, and, among other things, I say to him:
1. Yesterday, I bought a new laptop. I had saved up for months to afford it. My old laptop had started to malfunction, so it was time for an upgrade. I decided to buy the latest model from my favorite brand. When I arrived at the store, I realized that I had left my wallet at home. I felt so embarrassed!
As I see it, the past perfect "had saved" means that the saving up comes before the buying. The past perfect "had started" emphasizes the fact that the old laptop started to malfunction before I bought the new one. Therefore, using the past perfect tense for the bolded verbs appears logical. Now I wonder if this version is possible:
2. Yesterday, I bought a new laptop. I have saved up for months to afford it. My old laptop started to malfunction, so it was time for an upgrade. I decided to buy the latest model from my favorite brand. When I arrived at the store, I realized that I had left my wallet at home. I felt so embarrassed!
In my view, the present perfect "has saved" is justified because I bought the laptop just yesterday, thus making the purchase very recent and a part of my present. The justification for the simple past "started" is that it's clear from the context that the old laptop started to malfunction before I bought the new one, so there's no need to use the past perfect "had started" to make that clear to the listener.
Do you agree with my reasoning, and do you think that either version can be used in this case? Thank you.