could do it every year if you wanted to
don't think a monitor is required as personal computer  --- I thought need to buy a whole set of PC which included a monitor, mouse and keyboard?
points worth considering:
1) no other lifestyle relief being claimed, e.g. internet subscription/phone  --- this means if claim PC then cannot claim internet subscription/phone ?
2) PC within the budget of RM 3,500 (if including esport equipment)
3) your marginal tax rate  -- meaning?
4) resale value of your PC  -- Agree

Wow, good idea if can.
As Carousel transaction screenshot has no real confirmed lhdn recognise able seller/buyer details that they can seek to contact/check to seek further clarification if needed. So ..... like this can??
"A" buy new pc claim tax, sell in carousel to "B" buy and claim tax.
Next year, "B" sell, "A" buy from carousel claim tax, then sell in carousel to "B". "B" buy n claim tax.
Repeat every year.
A n B can be husband wife, brother sister or ownself, etc etc too