Brand and model name or number of both PSUs if you will please.
The MBs PCI-E X1 and X16 slots are not detected by Speccy which means that they are either disabled in the BIOS or that they have failed, Speccy also shows that the PSUs +12V rail which powers add on video cards (among other things) is low so we need to check that further;
RAM
Memory slots
Total memory slots: 4
Used memory slots: 3
Free memory slots: 1
Memory
Type: DDR2
Size: 3072 MBytes
Channels #: Single
DRAM Frequency: 253.9 MHz
CAS# Latency (CL): 4 clocks
RAS# to CAS# Delay (tRCD): 4 clocks
RAS# Precharge (tRP): 4 clocks
Cycle Time (tRAS): 12 clocks
Bank Cycle Time (tRC): 16 clocks
Command Rate (CR): 2T
Physical Memory
Memory Usage: 41 %
Total Physical: 2.87 GB
Available Physical: 1.67 GB
Total Virtual: 5.75 GB
Available Virtual: 4.40 GB
SPD
Number Of SPD Modules: 3
Slot #1
Type: DDR2
Size: 1024 MBytes
Manufacturer: Samsung
Max Bandwidth: PC2-5300 (333 MHz)
Part Number: M3 78T2953CZ3-CE6
Serial Number: 85112E18
Week/year: 40 / 07
Timing table
JEDEC #1
Frequency: 200.0 MHz
CAS# Latency: 3.0
RAS# To CAS#: 3
RAS# Precharge: 3
tRAS: 8
tRC: 11
Voltage: 1.800 V
JEDEC #2
Frequency: 266.7 MHz
CAS# Latency: 4.0
RAS# To CAS#: 4
RAS# Precharge: 4
tRAS: 11
tRC: 15
Voltage: 1.800 V
JEDEC #3
Frequency: 333.3 MHz
CAS# Latency: 5.0
RAS# To CAS#: 5
RAS# Precharge: 5
tRAS: 14
tRC: 19
Voltage: 1.800 V
Slot #2
Type: DDR2
Size: 1024 MBytes
Manufacturer: Samsung
Max Bandwidth: PC2-5300 (333 MHz)
Part Number: M3 78T2863CZS-CE6
Serial Number: 71492C08
Week/year: 26 / 07
Timing table
JEDEC #1
Frequency: 200.0 MHz
CAS# Latency: 3.0
RAS# To CAS#: 3
RAS# Precharge: 3
tRAS: 9
tRC: 12
Voltage: 1.800 V
JEDEC #2
Frequency: 266.7 MHz
CAS# Latency: 4.0
RAS# To CAS#: 4
RAS# Precharge: 4
tRAS: 12
tRC: 16
Voltage: 1.800 V
JEDEC #3
Frequency: 333.3 MHz
CAS# Latency: 5.0
RAS# To CAS#: 5
RAS# Precharge: 5
tRAS: 16
tRC: 21
Voltage: 1.800 V
Slot #3
Type: DDR2
Size: 1024 MBytes
Manufacturer: Corsair
Max Bandwidth: PC2-4300 (266 MHz)
Part Number: VS1GB533D2
Timing table
JEDEC #1
Frequency: 200.0 MHz
CAS# Latency: 3.0
RAS# To CAS#: 3
RAS# Precharge: 3
tRAS: 9
tRC: 11
Voltage: 1.800 V
JEDEC #2
Frequency: 266.7 MHz
CAS# Latency: 4.0
RAS# To CAS#: 4
RAS# Precharge: 4
tRAS: 12
tRC: 15
Voltage: 1.800 V
Motherboard
Manufacturer: MICRO-STAR INTERNATIONAL CO.,LTD
Model: MS-7367 (CPU 1)
Version: 1.0
Chipset Vendor: ATI
Chipset Model: Radeon X1250
Chipset Revision: 00
Southbridge Vendor: ATI
Southbridge Model: SB600
Southbridge Revision: 00
System Temperature: 34 °C
BIOS
Brand: American Megatrends Inc.
Version: V1.6
Date: 5/5/2009
Voltage
+3.3V: 3.344 V
CPU CORE: 1.288 V
VIN2: 2.176 V
VIN3: 1.305 V
+5V: 5.213 V
+12V: 8.888 V
VIN6: 1.312 V
VSB3V: 3.360 V
CMOS BATTERY: 3.216 V
PCI Data
Slot PCI
Slot Type: PCI
Slot Usage: Available
Bus Width: 32 bit
Slot Designation: PCI1
Characteristics: 3.3V, Shared, PME
Slot Number: 0
Slot PCI
Slot Type: PCI
Slot Usage: Available
Bus Width: 32 bit
Slot Designation: PCI2
Characteristics: 3.3V, Shared, PME
Slot Number: 1
Also worth mentioning is that you have an odd stick of Ram, this means that you are running in single channel mode and at the reduced speed of the single stick of Corsair memory, you also only have Windows Defender running and no real time anti virus protection.
Going offline shortly as it is getting late here in the UK and I have an early start in the morning