The intel 845 main wrench test card shows what A7 means

Generally speaking, most of his BIOS does not move when it is turned on "FF" or "00" is a motherboard or CPU failure, but generally speaking, the possibility of a bad CPU is still very small. If it stops on the "B" class, it is generally a graphics card failure, and if it stops on the "C" class, it is generally a memory failure, and the detection card is generally used when the computer is not lit, and this situation like yours should be a problem with the motherboard, because generally speaking** starts from FF and then then B, C, and finally back to FF, that is, CPU, motherboard, graphics card, memory、、、 your ** has not stopped before it reaches B, C, etc., so it should be the motherboard! It is recommended that you first check whether the capacitance of the motherboard is broken, and then touch the Nanqiao chip with your hands, if it is very hot, it must be a problem with the motherboard.

This is related to the model of the motherboard. Find out what model your motherboard is

If there is no problem with the memory, it is a problem with the motherboard, and check from the power supply of the motherboard memory.

Unplug the memory, install 3200 first, and boot ......

Turn it off again ......An 2100 went up to ......

Boot ......

A7 is a memory controller failure, which is usually a northbridge problem.

Reinsert memory. Memory slot change or memory change.

A7 is a memory problem.

The memory is dirty. Oxidized.

And the resistance value of Kaiyin next to it has changed. ,.False soldering.

The north bridge is partially broken.

Wait a minute. It means that the power supply of the memory and the clock are normal.

Some data transfers are also normal.

It's just that one or two of the data cables are out of order.

Try changing the memory.

a6…Take Zen....

It may be that the CPU power supply chip is unstable and causes the dust to disappear.

It's best to take it for overhaul.

The architecture is different. Can the power consumption be compared?

Take Apple's own all-in-one laptop. It's all Intel's U

One is a reduced instruction set, and the other is a complex instruction set, and these two things are not comparable.

There is no comparison, one is mobile and one is computer.

I serve you! It's too far away from the difference, change the motherboard, it's all pasted and have to be repaired?

The reason for this is that the judge said that there was obviously something wrong with the card slot. The black screen means that the graphics card is not displayed, and the problem lies in the graphics card slot.

Because after unplugging the memory, the motherboard alarms that there is nothing wrong with the memory, and there is no fault with the circuit near the memory. ~!Seeing a friend change a board, a try can solve the problem.