I assume you mean 'tried' another monitor. no, i don't have another one. this problem is very intermittent- like once a month.
• Monitor: HP w1907
• Genuine Windows 7 Home Premium [64-bit]
• Intel(R) Core(TM) i5-2400 quad-core processor [3.1GHz, 6MB cache]
• 12GB DDR3-1066MHz SDRAM [3 DIMMs]
• FREE UPGRADE! 1TB 7200 rpm SATA 3Gb/s hard drive from 750GB
• Office 2010
• SAVE $20! Norton Internet Security(TM) 2011 - 15 month
• 1GB DDR3 Radeon HD 6450 [DVI, HDMI. VGA adapter]
• SuperMulti DVD Burner
• Integrated Ethernet port, No wireless LAN
• 15-in-1 memory card reader, 2 USB 2.0 (front), audio, 2 USB (top rear-facing)
• TV tuner, ATSC-NTSC with PVR, remote
• Beats Audio (tm) -- integrated studio quality sound
• Premium HP keyboard and optical mouse