Two main things to know before you can attempt a Processor upgrade.
1) What Processor socket is on the motherboard?
2) What motherboard chipset is on the motherboard?
(Northbridge and Southbridge chip. Unless it's a motherboard that supports Intel Core 13, Core i5, Core i7, and Core i9 processors)
According to specifications I found online just now, the BenQ Joybook A53 comes with an,
Intel Core2 Duo T7250 processor,
http://laptops.techfresh.net/benq-joybook-a53/Scroll down.
(Only 512MB's of DDR2 Sdram (SO-DIMM) ram memory that operates at 667Megahertz?
{ PC2-5300} Yecch! You need at LEAST 1GB of ram memory. (512MB + 512MB = 1GB.
2GB would be best)
http://www.laptop-software.com/benq/benq-joybook-a53-features-and-specifications/Information on the Intel mobile Core2 Duo T7250 processor,
http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#Core_2_Duo_2Scroll the page down until in the left column you see T7250. Then read across, and match the headings above.
Uses a Socket M processor socket,
http://en.wikipedia.org/wiki/Socket_MIs your problem directed to a BenQ Joybook A53 Notebook PC, or is it another model?
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